OPERA TING GUIDE V2
QUICK-START OPERATION DECLARATION OF CONFORMITY FBX-2020 CONTROLS 4
APPLICATION OF COUNCIL DIRECTIVE 2 ABOUT THE FBX-2020 3
FIFTH OCTAVE FILTER STAGE ACTIVITY POWER SWITCH FUSE

APPLICATION DIAGRAMS

FREQUENCY RESPONSE WORLD'S BEST FEEDBACK CONTROLLER WHO NEEDS FBX? WHY THE FBX? DIRECT HIT ON FEEDBACK! ACTIVE/BYPASS SWITCH SIGNAL LEVEL RESET SET TOTAL NUMBER OF FILTERS SET FIXED LOCK FIXED FILTERS A/C POWER INPUT AUDIO INPUTS & OUTPUTS
FBX SETUP FOR MONITORS FBX SETUP FOR ENTIRE MIX FBX SETUP FOR SINGLE INSERT POINT FBX SETUP FOR INSERT SEND & RETURN
FBX-2020 OPERATING INSTRUCTIONS
CLIPGUARDTM TURBO MODE GUIDE HOW TO OPERATE THE FBX-2020 HOW TO USE THE FBX-2020 FEATURES USING THE LOCK FIXED FEATURE SELECTING FILTER WIDTH IMPORTANT OPERATING CONSIDERATIONS MEMORY BYPASS MODE RESETTING THE FILTERS TURBO MODE SETUP DEFEATING TURBO MODE MOBILE VS. STATIONARY MICROPHONES
FREQUENTLY ASKED QUESTIONS INDEX CAUTIONS & WARNINGS LIMITED WARRANTY
WHERE THE FBX FITS IN YOUR SOUND SYSTEM A NOTE ABOUT GRAPHIC EQUALIZERS UNDERSTANDING FIXED & DYNAMIC FILTERS CLIPGUARD ADAPTIVE CLIP LEVEL CONTROL
FBX-2020 ENGINEERING SPECIFICATIONS 10

QUICK-START OPERATION

For best results, read all operating instructions before using the FBX-2020. If you're already familiar with the FBX or just want a basic overview of FBX operation, this simple quick-start procedure is for you. More detailed instructions are on page 7 inside this operating guide.
1. 2. 3. Place the FBX between the output of your mixer and the input of your power amp. With the master volume down, put the FBX-2020 in active mode (red BYPASS LED off), then slowly raise the mixer master volume to the point of feedback. Keep raising the master volume until all of your fixed filters and one dynamic filter are set, then lower the volume slightly. (Factory default is nine fixed and three dynamic filters.) The rest of the filters continually catch and update new feedback frequencies throughout the program. You're ready to go. READ THE ENTIRE OPERATING GUIDE FOR COMPLETE INSTRUCTIONS.
CONGRATULATIONS! You now have the state-of-the-art in feedback control. Your Sabine FBX-2020 Feedback Exterminator a single channel, 20-bit digital filtering device gives you automatic real-time feedback control and increases the clarity and volume of your system. The FBX-2020 incorporates the latest in digital signal processing technology. It automatically senses feedback in a sound system and determines its pitch. It then places one of 10 Constant Q micro-filters on the resonating frequency and eliminates the feedback in typically less than one second.
Special features of the FBX-2020: An improved algorithm that allows the FBX-2020 to better distinguish the difference between feedback and music Improved 20-bit digital resolution, providing superior dynamic range and signal-to-noise ratio 10 feedback filters, giving the unit more feedback elimination power for the toughest venues. ClipGuard adaptive clip level control, with TURBO setup mode, increases the effective dynamic range by more than 10dB and makes setup faster and easier. Standard FBX features such as lockable fixed filters and switchable 1/10- and 1/5-octave Constant Q filters are also included and now have convenient front panel switches.

1995-2001 Sabine, Inc.

DECLARATION OF CONFORMITY
Application of Council Directive: 73/23/EEC and 89/336/EEC
Standard to which conformity is declared: EN 60065:1993 EN 50082-1:1992 EN 55022 Class B
Manufacturers Name: Manufacturers Address:
Sabine, Inc. 13301 Highway 441 Alachua, FL 32615-8544 USA
Type of Equipment: Model No.: Serial No.: Year of Manufacture:

Equalizer FBX-2020

1997 and on
I, the undersigned, herby declare that the equipment specified above conforms to the above Directive and Standard.
Place: Alachua, Florida, USA Date: October 4, 2000
Signature: Full Name: Doran Oster, Sabine President

ABOUT THE FBX-2020

Feedback Frequency

FBX filter

Direct Hit on Feedback!
The FBX targets feedback without taking a big chunk out of your sound. Tests prove that a single 1/3-octave EQ slider pulled down 12 dB removes almost half the power going to the speakers over a two-octave range. And, as this illustration shows, you can't place a graphic EQ filter precisely on the ringing frequency. When you pull down multiple sliders in a normal setup (below), you end up with giant holes in your music. On the other hand, FBX micro-filters are 10 times narrower - you get back up to 90% of the power you lose with a graphic EQ! That means more gain before feedback and no loss in sound quality.

FREQUENCY RESPONSE: FBX 1/10-Octave Filter Vs. 1/3-Octave Graphic EQ Filter (12 dB depth; Log Scale).

Frequency Response

Full Set-Up FBX Vs. 1/3 Octave Graphic Equalizer. Test procedure: A PA system was set up using a microphone, mixer, FBX, power amp and two speakers. The system's gain was raised until the FBX removed nine feedback points. Next, the FBX was replaced with a 1/3 octave graphic EQ. The EQ was adjusted while the system gain was raised to the same level achieved with the FBX. The frequency response curves of each device were then plotted.
World's Best Feedback Controller
Before the invention of the FBX, the most common device for controlling feedback was the 31-band graphic EQ. However, the FBX has three distinct advantages. The most obvious is the FBX functions automatically, even during the program. Another is the FBX micro-filters are precisely placed while EQ filters are fixed. The difference: FBX filters do not have to be as deep, so there is more system gain. The most important advantage is that FBX micro-filters are ten times narrower than 31-band EQ filters. FBX micro-filters return up to 90 percent of the power removed by EQ filters. Over the years, engineers stopped using 12-band EQs in favor of the narrower-filter 31-band EQ for controlling feedback. The FBX represents the next step. An EQ would need more than 10,000 sliders to be equivalent to your FBX. With the FBX-2020, your monitors will finally sound loud enough, everyone in the audience will understand each word, and the mains will sound natural and transparent.

Who Needs FBX?

Virtually every sound system will be improved with the FBX. Small bands that do not have sound technicians can now increase their monitor volumes so they can hear themselves clearly and with full fidelity, without worrying if the program is going to be ruined by feedback. Auditoriums and churches of all sizes will enjoy reliable feedback control. Hotels and conference centers around the world can offer meeting rooms with sound systems that wont howl during programs. The FBX-2020 can be installed in theaters, schools, sports arenas, courtrooms anywhere multiple microphones are used. It can also be used for teleconferencing, intercoms or interactive remote classrooms.

Why the FBX?

The simple beauty of the FBX is its ability to quickly and effectively eliminate feedback with narrower filters than ever before possible. The FBX delivers superior sound quality automatically.

FBX-2020 CONTROLS

FBX-2020 Front Panel

Active/Bypass Switch

Bypass mode takes the unit out of the signal path so that it will have no effect on the program. In active mode, the unit controls feedback automatically. The red BYPASS LED lights when the unit is in bypass mode.

Lock Fixed Filters

When the LOCK FIXED button is pressed, its LED will light to indicate that the FBX is in LOCK FIXED mode. LOCK FIXED mode can be activated at any time after system setup and will stay on until the button is pressed again and the LED turns off. Engaging the LOCK FIXED button also takes the FBX-2020 out of ClipGuard's TURBO setup mode.

Signal Level

The LED ladder indicates the signal strength relative to the FBX's input clip level. The red CLIP LED indicates clipping; it also indicates the unit is in TURBO mode.

Fifth Octave

Press the button at any time to select wider filters for any new filters to be set. It is possible to have both 1/5 and 1/10 octave Constant Q filters active in one channel simultaneously.
To reset ALL filters, hold the reset button for 4 seconds until all filter LEDs are off.

Filter Stage Activity

When one of the units 10 filters is activated, the corresponding LED lights. A blinking LED indicates the filter that was most recently activated.
Set Total Number of Filters
To set the total number of filters, depress the button for 4 seconds and then release. The LEDs will begin to light in sequence. When the LED corresponding to the desired number of filters lights, press the button to register your selection.

Power Switch

The ON/OFF switch is a two-position push button switch. The power indicator LED will light when the FBX is operational.

Set Fixed

To set fixed filters, hold down the button for 4 seconds and then release. The LEDs will begin to light in sequence. When the LED corresponding to the desired number of fixed filters lights, press the button to register your selection. (Factory default is nine fixed and three dynamic filters.)

FBX-2020 Back Panel

A/C Power Input
The FBX-2020 is factory configured to operate at either 115 VAC or 230 VAC. Using the wrong input voltage may cause permanent damage to the unit and will void the warranty.
This equipment is fitted with an IEC power inlet incorporating a built-in fuse holder. To change the fuse in this socket: 1. Disconnect the power cord from the unit. 2. Pull out the fuse holder and remove the old fuse. 3. Install the new fuse into the holder. Replace only with 5x20mm, 0.315A, 250V F (fast acting) fuse. 4. Refit the fuse cover.

Audio Inputs & Outputs
1/4" TRS and XLR balanced and unbalanced.

FBX Setup for Monitors

FBX Out
FBX IN Amp In Monitor OUT Amplifier

FBX Setup for Entire Mix

FBX OUT Amp IN Amplifier FBX IN
All other Signal Processing Equipment

Main OUT

FBX Setup for Single Insert Point
FBX-2020 OUTPUT & INPUT
Mixer Input Channel B Mixer Input Channel B

1/4" TRS plug

Note: If you're using a mixer with unbalanced 1/4" outputs, you must use standard unbalanced cables and connectors when connecting it to the FBX. Similarly, if your mixer is wired for balanced 1/4" (Ring/Tip/Sleeve) outputs, you must use that type of connector. If you don't, you may experience a loss of gain when using the FBX. The FBX is designed for balanced output. If either side of the balanced output is grounded at any point, a 6 dB loss in dynamic range may occur (+21dBV max. signal level unbal.; +27dBV max. signal level bal.).

High Z

Insert
Use 1/4" TRS plug for balanced sends/inserts Use 1/4" TS plug for unbalanced sends/inserts

Mixer Input Channel A

FBX Setup for Insert Send & Return

Mixer Input Channel B

High Z Insert Send
Where the FBX fits in your sound system
Place the FBX anywhere in the sound system that a graphic equalizer might be used to control feedback. The most common place is between the output of the mixer and the input of a power amp. In this position, the FBX can sense and eliminate feedback occurring in any channel of the mixer. The FBX can also be used on a mixer insert point.

Insert Return

A note about graphic equalizers
Graphic EQs are excellent for shaping sound, and they are fairly simple to use. However, using one-octave-wide EQ filters to control feedback invariably causes an unnecessary decrease in the gain and fidelity of the program. It's easy to see that if feedback occurs somewhere between the sliders, you will have to pull one of those EQ sliders down pretty far to eliminate feedback. That pulls out plenty of your program, too. On the other hand, you'll get considerably more net gain and much better sound quality if you use wide graphic EQ filters for tone control and insist on narrow filters for feedback control. If you use an equalizer, place the FBX after the EQ in the signal path. Use the EQs controls to shape the tonal response of the sound system, but DO NOT NOTCH FOR FEEDBACK.
the number of fixed filHigh Z ters; i.e., increasing the number of fixed filters increases the Insert systems gain before Send feedback. The FBX's DYNAMIC FILTERS Insert control intermittent Return feedback that comes and goes throughout the program. They are continually reset automatically to different frequencies as new feedback occurs during the program. For most applications, the optimal setting is nine FIXED and three DYNAMIC FILTERS. This is the factory default.

ClipGuard Adaptive Clip Level Control powerful new feature: Sabine's ! Your FBX-2020 has a adaptive clip level control. Until patented ClipGuard
Sabine invented ClipGuard, engineers had to set audio equipment input and output levels to a compromised setting that allowed too much noise in quiet programs and risked clipping during high-level programs. With ClipGuard, no front panel program level control is needed. It automatically matches the FBX-2020 internal dynamic range to the constantly changing program level and maintains unity gain. ClipGuard extends the effective dynamic range of your FBX-2020 from 100dB to 105dB! ClipGuard incorporates TURBO mode setup, another new feature. It cuts the time for FBX filter initialization to just a few

Read This

Understanding FIXED & DYNAMIC filters Before operating the FBX, you need to understand the two ! types of FBX filters: FIXED and DYNAMIC. FIXED FILTERS
retain their frequency center-points until the unit is reset by the user. The systems gain before feedback is limited primarily by
seconds, and it greatly reduces the volume level of the feedback during setup. The FBX-2020 is set in TURBO mode at the factory and automatically engages every time you press RESET or SET TOTAL NO (to reset filters or set total number of filters). The FBX-2020 automatically returns to normal program mode when the first dynamic filter is set or when you press the front panel LOCK FIXED button. ALL FILTER LEDS WILL CYCLE TO INDICATE THE FBX IS ABOUT TO EXIT TURBO MODE.
ClipGuardTM TURBO Mode Guide
What is TURBO mode? TURBO mode speeds up the FBX filter initialization process so that it takes only a few seconds, and it greatly reduces the volume level of the feedback during setup. If the red CLIP LED flashes when no other signal level LEDs are on, TURBO is on. TURBO turns off automatically after the first dynamic filter is set, or you can turn it off manually by pressing the LOCK FIXED button. (Press it again to unlock the filters.) NO! TURBO mode should be turned off either automatically or manually before your program begins. If left on, the 2020 will clip, may set FBX filters improperly. If you press LOCK FIXED to turn off TURBO mode before all the fixed filters have been set, and you want to use the rest of the fixed filters, press LOCK FIXED again right away before a dynamic filter sets. Once a dynamic filter sets, you will not be able to use the rest of the fixed filters unless you reset and start the initialization again.

How To Operate The FBX-2020
Follow these steps to obtain the maximum gain before feedback without changing the tonal quality of your program. 1. Place the speakers and microphones in the positions where they will be used during the program. Avoid placing microphones directly in front of speakers. 2. If you possess any equipment in the signal path with a noise gate, you MUST DISENGAGE these noise gates prior to the setup procedure. You may reengage these noise gates upon conclusion of your FBX setup. (It is also recommended to disengage compressors in the signal path) 3. Set the master volumes to their lowest positions. Turn on the mixer, then the FBX (make sure the FBX is in BYPASS mode, with the red BYPASS LED on), then any other accessories and finally the power amp. If you are using a graphic EQ, adjust only for the desired tonal qualities, but DO NOT NOTCH FOR FEEDBACK. Adjust the balance for each mixer channel, and set the sound systems master volume to minimum. 4. Press RESET until all LEDs stop flashing. 5. You may set the total number of filters you want to activate (factory default is 10 filters - skip to #6 if default is OK for your application) by holding down the SET TOTAL NO. button for 4 seconds. The LEDs will blink 4 times and then go out. Release the SET TOTAL NO. button. The LEDs will begin to light in sequence. When the LED corresponding to the desired number of filters lights, press the SET TOTAL NO. button. You've successfully set the total number of filters. 6. Now set the number of fixed filters you need (factory default is 7 fixed and 3 dynamic - skip to #7 if default is OK for your application). Depress the SET FIXED button for 4 seconds. The total number of enabled filters set in step 5 will blink 4 times and go out. Release the SET FIXED button, and the LEDs will begin to light in sequence. When the LED corresponding to the desired number of fixed filters lights, press the SET FIXED button. You've successfully set the number of fixed filters. 7. Press BYPASS to put the FBX in active mode (red LED off). 8. Slowly raise the sound systems master volume until feedback occurs. The FBX will quickly remove the feedback. The first FILTER LED will then blink to indicate a filter has been set. Repeat this procedure until all of the FIXED FILTERS and one of the DYNAMIC FILTERS are set. (The Clip Level mode LED will go off.) 9. Now lower the master volume slightly so that the system is not on the verge of another feedback point. This is the maximum volume level that the FBX will be able to provide. Higher levels will cause uncontrollable feedback. 10. You're ready to go. ClipGuard will automatically match the input level to the best internal dynamic range. IMPORTANT TIP

You can mix 1/10- and 1/5-octave filters in the same channel. If you have an especially bad feedback problem, try making the first few filters 1/5-octave and the remaining filters 1/10-octave.
How do I know TURBO is on? How do I turn off TURBO?
Can the 2020 work during the program with TURBO on? Why won't all the fixed filters set?
NOTE: If you press LOCK FIXED to turn off TURBO mode before all the fixed filters have been set, and you want to use the rest of the fixed filters, press LOCK FIXED again right away before a dynamic filter sets. Once a dynamic filter sets, you will not be able to use the rest of the fixed filters unless you reset and reinitialize the unit. WARNING: Follow the setup procedure outlined on the left, and do not play audio program during TURBO setup mode. Otherwise, the FBX-2020 will clip and may set FBX filters improperly. (Clip level is set to the lowest level so the feedback clips quickly; therefore, your program will also be clipped in TURBO mode. Be sure a dynamic filter is set, and if one isn't, press the LOCK FIXED button before your program begins. Press LOCK FIXED again if you want FIXED filters to remain active.) You'll know the 2020 is in TURBO mode if the red CLIP LED flashes when no other signal level LEDs are on. (See "How do I turn off Turbo?" in the ClipGuard TURBO Mode Guide above.) NOTE: Any loud sounds picked up by open microphones while TURBO is engaged may cause FBX filters to set. For this reason we recommend maintaining silence as much as possible during the short time TURBO is engaged. If your venue is too noisy to take advantage of TURBO mode, turn off TURBO by pressing LOCK FIXED on, then off before you initialize for feedback. Remember: if you leave LOCK FIXED on, the fixed filters wont initialize. The LED indicating LOCK FIXED should be off when initializing.
How To Use The FBX-2020 Features
Using the LOCK FIXED feature
In very few situations the FBX may mistake music for feedback and drive the fixed filters deeper than necessary, such as in a church with a pipe organ, or during a performance with a great deal of intentional sustained electric guitar feedback. You can prevent the fixed filters from deepening beyond their preset depth by pressing the LOCK FIXED button on the front panel after setup. The LOCK FIXED LED will light to indicate that the FBX is in LOCK FIXED mode. The fixed filters stay locked until you press the LOCK FIXED button again.

Selecting filter width

If you're using the FBX for a music application, the standard 1/ 10-octave Constant Q filter is usually preferable. However, in spoken word applications, such as lectures or teleconferencing, we recommend using the wider 1/5-octave filter for more robust feedback control. You may enable the 1/5-octave filters by pressing the "FIFTH OCTAVE" button, and the built-in LED will light. Only filters set after pressing the button in will be 1/ 5-octave. Press the button again to set subsequent filters to standard 1/10-octave filters. You can mix filter widths in the same channel (see "IMPORTANT TIP" below).

setup feature cuts the time for FBX filter initialization to just a few seconds, and it reduces the volume level of the feedback during setup. The 2020 is set in TURBO mode at the factory and automatically engages every time you press RESET (resetting filters). The 2020 automatically returns to normal program mode when the first dynamic filter is set or when you press the front panel LOCK FIXED button. ALL FILTER LEDS WILL CYCLE TO INDICATE THE FBX IS ABOUT TO EXIT TURBO MODE. WARNING: TURBO Mode will cause distortion in your audio program it is for setup only. You must follow the setup procedure outlined in the previous section, and do not play program during TURBO setup mode. Otherwise the 2020 will clip, and filters may be set improperly. (Clip level is set to the lowest level so the feedback clips quickly; therefore, your program will also be clipped in TURBO mode. Be sure a dynamic filter is set, and if one isnt, press the LOCK FIXED button before your program begins.) Youll know the 2020 is in TURBO mode if the red CLIP LED flashes when no other signal level LEDs are lit.

Defeating Turbo Mode

You can manually override TURBO mode if necessary: Press LOCK FIXED (the LOCK FIXED light will turn on), then press it again. (LOCK FIXED light will go out).
Important Operating Considerations

Memory

The FBX stores the positions and depths of the filters in nonvolatile internal memory when the unit is turned off or during a power failure. The unit will return all filters to their previous frequencies and depths when it is turned back on.
Mobile vs. Stationary Microphones
One significant advantage offered by the Sabine family of FBX feedback eliminator products is their ability to adapt to changing acoustical relationships involving sound system components and various user applications. One major source of potential feedback problems arises in situations with wireless microphones, when the user of the wireless mic is moving around the stage/auditorium. As a microphone moves in a sound space, with varying degrees of proximity to the speakers and varying acoustic responses, feedback frequencies may shift. In such a situation, feedback-free mobility may be more important a concern than maximum system gain. One method of setting FBX filters with mobile microphones is to turn a microphone on and walk around to the various possible microphone locations. At the same time, raise the system gain and set the FBX filters one at a time. In some situations, raising the number of dynamic filters (versus fixed FBX filters) may allow a second layer of defense against new feedback from new locations. However, in many mobile microphone set ups, fixed FBX filters will protect against feedback across the range of microphone mobility.

Bypass Mode

The FBX has a true power-off bypass. The signal is unaffected in BYPASS MODE even if the unit is turned off. Please note that if a combination of BALANCED and UNBALANCED inputs and outputs is used, the signal may be disconnected in BYPASS MODE.

Resetting the filters

The user must reset the FBX if the microphones or speakers are moved significantly. To reset the unit, place the PA systems master volume to minimum and then press the RESET button until the LEDs flash about 4 seconds and the FILTER LEDs stop flashing. Then follow the system initialization procedure explained previously.

TURBO Mode Setup

The FBX-2020 incorporates TURBO mode setup, which is indicated by a flashing red CLIP LED. This lightning-quick
FREQUENTLY ASKED QUESTIONS
Q. Can I place the FBX in the mixers EQ loop? A. A. Yes. Avoid this configuration if possible. You can configure the system this way only if each effects send of each mixer channel is set so that all of the signal is routed completely through the effects loop. You cannot mix dry signal with effects signal and still control feedback. The signal input LEDs do not light. The unit will not catch feedback. Why? The unit is not in the signal path. Check the connections. Be sure that the program is interrupted when the input is disconnected from the back of the unit. Can I mix balanced and unbalanced inputs and outputs? Yes. An unbalanced input and balanced output are compatible. However, a balanced input and unbalanced output may result in a 6 dB loss of dynamic range, and the bypass function may not operate correctly. The last filter to be automatically updated blinks. During normal operation, the blinking will move from filter to filter as they are reset. This gives the user a visual confirmation that the unit is responding to new feedback and is functioning properly. Sometimes during the initial setup, the first filter LED will blink before any feedback has been introduced into the system. Why? The FBX will set a filter if the system has a hum. Check for bad grounds. Try resetting the filters. Q. Can I place the unit in the mixer effects loop? Q. A. Q. A. Why does the FBX cause a noticeable hum? It hums if the main power voltage drops significantly below 10% of the specified voltage. Check the A/C power mains. Why does my system sound thin and muffled? Place the FBX in BYPASS MODE. If the system still sounds thin, your problem is probably with improper use of a graphic EQ. If the problem is really the FBX, reinitialize the system. Why does my program sound clipped and distorted? Make sure the FBX's TURBO mode has turned off before your program begins. Check the signal level ladder. If the red CLIP LED flashes when no other signal level LEDs are on, the FBX-2020 is still in TURBO mode. TURBO mode turns off automatically after the first dynamic filter is set, or you can turn it off manually by pressing the LOCK FIXED button. Why won't the rest of the fixed filters set after I press LOCK FIXED to turn off TURBO mode? If you press LOCK FIXED to turn off TURBO mode before all the fixed filters are set, and you want to use the rest of the fixed filters, press LOCK FIXED again before a dynamic filter sets. Once a dynamic filter sets, you will not be able to use the rest of the fixed filters unless you reset the unit and start initialization again.

(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)
FBX-2020 SIMPLIFIED INTERNAL BLOCK DIAGRAM

(Shows one channel only)

CAUTIONS & WARNINGS
Warning! This equipment must be earthed. Caution! Risk of electric shock. Do not open. Caution! Shock hazard. Do not remove covers. No user serviceable parts inside. Refer servicing to qualified service personnel. Warning! To reduce the risk of fire or electric shock, do not expose this product to rain or moisture. Attention! Cet appareil doit tre reli la terre. Attention! Risque de choc lectrique; ne pas ouvrir. Attention! Risque de choc; ne pas oter les capots. Aucune pice accessible l'intrieur. S'addresser un technicien qualifi. Attention! Pour rduire le risque d'incendie ou de choc lectrique, ne pas laisser l'appareil sous la plouie ou l'humidit. Achtung! Dieses Gert muss schutzgeerdet sein. Achtung! Gefar eines elektrischen Stormschlags. Gehause nicht ffnen. Achtung! Gefar eines elektrischen Stormschlags. Gehuse nicht ffnen. Keine con Benutzer zu bedienenden Teile im Gerteinneren. berlassen Sie das Gert zu Servicezwecken nur geschultem Fachpersonal. Um Brandgefar oder das Risiko eines elektrischen Schlags auszuschlieen, das Gert vor Nsse und Feuchtigkeit schtzen. Advertencia! Este equipo debe estar conectado a tierra. Precaucin! Reisgo de descarga elctrica. No abrir. Precaucin! Riesgo de descarga elctrica. No desmontar las tapas. Piezas interiores no reparables por el usuario. Reparable slo por personal cualificado. Advertencia! Para reducir el riesgo de incendio o de descarga elctrica no exponga este producto a la lluvia o humedad. FCC Statement: This device complies with Part 15, Class B, of the FCC Rules. Operation is subject to the following conditions: (1) This device may not cause harmful interference; and (2) This device must accept any interference received, including interference that may cause undesired operation. Warning: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio TV technician for help.

Warning!

The unit is designed to operate from standard AC power. Please be sure the power in your area is compatible with the power requirements marked on the rear of the unit. Using the wrong input voltage may cause permanent damage to the unit and will void the warranty. The FBX-2020P is supplied with one of the following AC power cords: Japan 100 VAC U.S./NorthAmerica 120 VAC Continental Europe 230 VAC United Kingdom 240 VAC Australia 240 VAC

Caution!

Replace the fuse with a fuse of exactly the same rating specified on the rear of the product.
1. 2. Read all safety and operating instructions before using this product. All safety and operating instructions should be retained for future reference. 3. Obey all cautions in the operating instructions and on the unit. 4. All operating instructions should be followed. 5. Use only shielded audio and data cables. 6. This product should not be used in the presence of moisture or rain, or near any water, i.e., a bathtub, sink, swimming pool, wet basement, etc. 7. This product should be located so that its position does not interfere with proper ventilation. Do not use in direct sunlight. Do not place flat against a wall or in a built-in enclosure that will impede the flow of cooling air. 8. This product should not be placed near a source of heat such as a stove or radiator. 9. Connect only to a power supply of the type marked on the unit adjacent to the power entry module. 10. Never break off the ground pin on the power supply cord. 11. Power supply cords should always be handled carefully. Never walk or place equipment on power supply cords. Periodically check cords for cuts or signs of stress, especially at the plug and the point where the cord exits the unit. 12. The power supply cord should be unplugged when the unit is to be unused for long periods of time. 13. Care should be taken so that objects do not fall and liquids are not spilled into the unit through the ventilation holes or any other openings. 14. This unit should be checked by a qualified service technician if: A. The power supply cord or plug has been damaged. B. Anything has fallen or been spilled into the unit. C. The unit does not operate correctly. D. The unit has been dropped or the enclosure damaged. 15. The user should not attempt to service this equipment. All service work should be done by a qualified service technician. OSHA 2201; 1995 revised.

Canadian Compliance Statement This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications. Le present appareil numerique n'emet pas de bruits radioelectriques depassant les limites applicables aux appareils numeriques de la class B prescrites dans le Reglement sur le brouillage radioelectrique edicte par le ministere des Communications du Canada. Japanese EMI Compliance Statement

CAUTION

EXPOSURE TO EXTREMELY HIGH NOISE LEVELS MAY CAUSE A PERMANENT HEARING LOSS. INDIVIDUALS VARY CONSIDERABLY IN SUSCEPTIBILITY TO NOISE INDUCED HEARING LOSS, BUT NEARLY EVERYONE WILL LOSE SOME HEARING IF EXPOSED TO SUFFICIENTLY INTENSE NOISE FOR A SUFFICIENT TIME. THE U.S. GOVERNMENTS OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION (OSHA) HAS SPECIFIED THE FOLLOWING PERMISSIBLE NOISE LEVEL EXPOSURES: DURATION/DAY IN HOURS 2 1-1/1/2 1/4 or less SOUND LEVEL IN dBA, SLOW RESPONSE 115
FBX and FBX Feedback Exterminator are registered trademarks of Sabine, Inc., and are the brand names of its line of automatic feedback controllers. Covered by U.S. Patent No. 5,245,665, Australian Patent No. 653,736, Canadian Patent No. 2,066,624-2, German Patent No. 69118486.0, and U.K. Patent No. 0486679. Other patents pending. REAL-Q and REAL-Q2 are protected by U.S. Patent No. 5,506,910. Other patents pending. Graphi-Q, POWER-Q, REAL-Q, and REAL-Q2 are trademarks of Sabine, Inc. Copyright 2001. All rights reserved.
ACCORDING TO OSHA, ANY EXPOSURE IN EXCESS OF THE ABOVE PERMISSIBLE LIMITS COULD RESULT IN HEARING LOSS. EAR PLUGS OR PROTECTORS IN THE EAR CANALS OR OVER THE EARS MUST BE WORN WHEN OPERATING THIS DEVICE IN ORDER TO PREVENT A PERMANENT HEARING LOSS, IF EXPOSURE IS IN EXCESS OF THE LIMITS AS SET FORTH ABOVE. TO ENSURE AGAINST POTENTIALLY DANGEROUS EXPOSURE TO HIGH SOUND PRESSURE LEVELS, IT IS RECOMMENDED THAT ALL PERSONS EXPOSED TO EQUIPMENT CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS SUCH AS THIS DEVICE BE PROTECTED BY HEARING PROTECTORS WHILE THIS UNIT IS IN OPERATION.
Register your Sabine products online at:

www.Sabine.com

LIMITED WARRANTY
THIS LIMITED WARRANTY VALID ONLY WHEN PURCHASED AND REGISTERED IN THE UNITED STATES OR CANADA. ALL EXPORTED PRODUCTS ARE SUBJECT TO WARRANTY AND SERVICES TO BE SPECIFIED AND PROVIDED BY THE AUTHORIZED DISTRIBUTOR FOR EACH COUNTRY. Ces clauses de garantie ne sont vaiables quaux Etats-Unis et au Canada. Dans tous les autres pays, les clauses de garantie et de maintenance sont fixees par le distributeur national et assuree par lui selon la legislation en vigueur. Diese Garantie ist nur in den USA and Kanada gultig. Alle Export-Produkte sind der Garantie und dem Service des Importeurs des jewelligen Landes untervorfen. Esta garantia es valida solamente cuando el producto es comprado en E.U. continentales o en Canada. Todos los productos que sean comprados en el extranjero, estan sujetos a las garantias y servicio que cada distribuidor autorizado determine y otrezca en los diferentes paises. ONE-YEAR LIMITED WARRANTY/REMEDY SABINE, INC. (SABINE) warrants this product to be free from defects in material and workmanship for a period of one (1) year from date of purchase PROVIDED, however, that this limited warranty is extended only to the original retail purchaser and is subject to the conditions, exclusions and limitations hereinafter set forth: CONDITIONS, EXCLUSIONS AND LIMITATIONS OF LIMITED WARRANTIES These limited warranties shall be void and of no effect if: a. The first purchase of the product is for the purpose of resale; or b. The original retail purchase is not made from an AUTHORIZED SABINE DEALER; or c. The product has been damaged by accident or unreasonable use, neglect, improper service or maintenance, or other causes not arising out of defects in material or workmanship; or d. The serial number affixed to the product is altered, defaced or removed; or e. The power supply grounding pin is removed or otherwise defeated. In the event of a defect in material and/or workmanship covered by this limited warranty, Sabine will repair the defect in material or workmanship or replace the product, at Sabines option; and provided, however, that, in any case, all costs of shipping, if necessary, are paid by you, the purchaser. THE WARRANTY REGISTRATION CARD (or ONLINE REGISTRATION FORM) SHOULD BE ACCURATELY COMPLETED, MAILED TO AND RECEIVED BY SABINE WITHIN FOURTEEN (14) DAYS FROM THE DATE OF YOUR PURCHASE. In order to obtain service under these warranties, you must: a. Bring the defective item to any Authorized SABINE DEALER and present therewith the ORIGINAL PROOF OF PURCHASE supplied to you by the AUTHORIZED SABINE DEALER in connection with your purchase from him of this product. If the DEALER is unable to provide the necessary warranty service, you will be directed to the nearest other SABINE AUTHORIZED DEALER which can provide such service. OR b. Ship the defective item, prepaid, to: SABINE, INC. 13301 HIGHWAY 441 ALACHUA, FL 32615-8544 Include therewith a complete, detailed description of the problem, together with a legible copy of the original PROOF OF PURCHASE and a complete return address. Upon Sabines receipt of these items: If the defect is remedial under the limited warranties and the other terms and conditions expressed have been complied with, Sabine will provide the necessary warranty service to repair or replace the product and will return it, FREIGHT COLLECT, to you, the purchaser. Sabines liability to the purchaser for damages from any cause whatsoever and regardless of the form of action, including negligence, is limited to the actual damages up to the greater of $500.00 or an amount equal to the purchase price of the product that caused the damage or that is the subject of or is directly related to the cause of action. Such purchase price will be that in effect for the specific product when the cause of action arose. This limitation of liability will not apply to claims for personal injury or damage to real property or tangible personal property allegedly caused by Sabines negligence. Sabine does not assume liability for personal injury or property damage arising out of or caused by a non-Sabine alteration or attachment, nor does Sabine assume any responsibility for damage to interconnected non-Sabine equipment that may result from the normal functioning and maintenance of the Sabine equipment. UNDER NO CIRCUMSTANCES WILL SABINE BE LIABLE FOR ANY LOST PROFITS, LOST SAVINGS, ANY INCIDENTAL DAMAGES OR ANY CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PRODUCT, EVEN IF SABINE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITED WARRANTIES ARE IN LIEU OF ANY AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR USE; PROVIDED, HOWEVER, THAT IF THE OTHER TERMS AND CONDITIONS NECESSARY TO THE EXISTENCE OF THE EXPRESS LIMITED WARRANTIES, AS HEREINABOVE STATED, HAVE BEEN COMPLIED WITH, IMPLIED WARRANTIES ARE NOT DISCLAIMED DURING THE APPLICABLE ONE-YEAR PERIOD FROM DATE OF PURCHASE OF THIS PRODUCT. SOME STATES DO NOT ALLOW LIMITATION ON HOW LONG AN IMPLIED WARRANTY LASTS, OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATIONS OR EXCLUSIONS MAY NOT APPLY TO YOU. THESE LIMITED WARRANTIES GIVE YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH MAY VARY FROM STATE TO STATE. THESE LIMITED WARRANTIES ARE THE ONLY EXPRESS WARRANTIES ON THIS PRODUCT, AND NO OTHER STATEMENT, REPRESENTATION, WARRANTY OR AGREEMENT BY ANY PERSON SHALL BE VALID OR BINDING UPON SABINE. In the event of any modification or disclaimer of express or implied warranties, or any limitation of remedies, contained herein conflicts with applicable law, then such modification, disclaimer or limitation, as the case may be, shall be deemed to be modified to the extent necessary to comply with such law. Your remedies for breach of these warranties are limited to those remedies provided herein, and Sabine gives this limited warranty only with respect to equipment purchased in the United States of America. INSTRUCTIONS-WARRANTY REGISTRATION CARD Mail the completed WARRANTY REGISTRATION CARD to: SABINE, INC. 13301 HIGHWAY 441 ALACHUA, FL 32615-8544 OR, register online at www.SabinePro.com NOTE: Keep the PROOF OF PURCHASE. In the event warranty service is required during the warranty period, you will need this document. There will be no identification card issued by Sabine, Inc. IMPORTANCE OF WARRANTY REGISTRATION CARDS AND NOTIFICATION OF CHANGES OF ADDRESS Should notification become necessary for any condition that may require correction, the REGISTRATION CARD, or information submitted using the ONLINE REGISTRATION FORM, will help ensure that you are contacted and properly notified. Notice of address changes - If you move from the address shown on the WARRANTY REGISTRATION CARD or ONLINE REGISTRATION FORM, you should notify Sabine of the change of address so as to facilitate your receipt of any bulletins or other forms of notification which may become necessary in connection with any condition that may require dissemination of information or correction. You may contact Sabine directly by telephoning (386) 418-2000. Please have the Sabine product name and serial number available when communicating with Sabine Customer Service.

WORLD'S BEST FEEDBACK CONTROLLER: Before the invention of the FBX, the most common device for controlling feedback was the 31-band graphic EQ. However, the FBX has three distinct advantages. The most obvious is that the FBX functions automatically, even during the program. Second, the FBX micro-filters are precisely placed while EQ filters are fixed. The difference: FBX filters do not have to be as deep or wide, so there is more system gain. The third most important advantage is that FBX micro-filters are ten times narrower than 31-band EQ filters. FBX micro-filters return up to 90 percent of the power removed by EQ filters. Over the years, engineers stopped using 12-band EQs in favor of the narrower-filter 31-band EQ for controlling feedback. The FBX represents the next step. An EQ would need more than 10,000 sliders to be equivalent to your FBX. With the FBX2020Plus, your monitors will finally sound loud enough, everyone in the audience will understand each word, and the mains will sound natural and transparent. WHO NEEDS THE FBX? Virtually every sound system will be improved with the FBX. Small bands that do not have sound technicians can now increase their monitor volumes so they can hear themselves clearly and with full fidelity - without worrying if the program is going to be ruined by feedback. Auditoriums and churches of all sizes will enjoy reliable feedback control. Hotels and conference centers around the world can offer meeting rooms with sound systems that wont howl during programs. The FBX2020-Plus can be installed in theaters, schools, sports arenas, courtrooms -- anywhere multiple microphones are used. It can also be used for teleconferencing, intercoms or interactive remote classrooms. WHY THE FBX? The simple beauty of the FBX is its ability to quickly and effectively eliminate feedback with narrower filters than ever before possible. The FBX delivers superior sound quality automatically.

FBX2020-Plus CONTROLS

FRONT PANEL

ACTIVE/BYPASS

Bypass mode takes the unit out of the signal path so that it will have no effect on the program. In active mode, the unit controls feedback automatically. The red BYPASS LED lights when the unit is in bypass mode.

SET TOTAL NO.

To set the total number of filters, depress the button for 4 seconds and then release. The LEDs will begin to light in sequence. When the LED corresponding to the desired number of filters lights, press the button to register your selection. This also automatically puts the unit into Turbo mode.

FIFTH OCTAVE

Press the button at any time to select wider filters for any new filters to be set. It is possible to have both 1/5 and 1/10 octave constant "Q" filters active in one channel simultaneously.

SIGNAL LEVEL

The LED ladder indicates the signal strength relative to the FBX's input clip level.

FILTER STAGE ACTIVITY

When one of the units filters is activated, the corresponding LED lights. A blinking LED indicates the filter that was most recently activated.

SET FIXED

To set fixed filters, hold down the button for 4 seconds and then release. The LEDs will begin to light in sequence. When the LED corresponding to the desired number of fixed filters lights, press the button to register your selection.
Press and hold until 'Dynamic Filter' LEDs go out to reset the dynamic filters. Hold until all LEDs go out to reset all filters. This also automatically places the unit into Turbo mode.

POWER SWITCH

The ON/OFF switch is a twoposition push button switch. The power indicator LED will light when the FBX is operational.
LOCK FIXED FILTERS TURBO MODE
Turbo Mode is designed to allow maximum feedback sensitivity for setting fixed filters during setup only. This default setup mode allows the FBX to grab feedback much faster and at a much lower level, making setup faster and quieter. When a channel of the 2020Plus is in Turbo mode, the clip level light flashes. DO NOT ENTER TURBO MODEDURINGAPERFORMANCE. When the "LOCK FIXED" button is pressed, its LED will light to indicate that the FBX is in "LOCK FIXED" mode. "LOCK FIXED" mode can be activated at any time after system set-up and will stay on until the button is pressed again and the LED turns off.

BACK PANEL

A/C POWER INPUT The FBX2020-Plus is factory configured to operate at either 115 VAC or 230 VAC. Using the wrong input voltage may cause permanent damage to the unit and will void the warranty.
FUSES This equipment is fitted with an IEC power inlet incorporating a builtin fuse holder. To change the fuses in this socket: 1. Disconnect the power cord from the unit. 2. Pull out the fuse holder and remove the old fuse. 3. Install a new fuses into the holder. Replace only with 5x20mm, 0.315A, 250V F (fast acting) fuses. 4. Refit the fuse cover.
INPUTS AND OUTPUTS 1/4" TRS and XLR balanced and unbalanced. GROUND LIFT Use this switch to choose between grounded or lifted ground.

APPLICATIONS

FBX SET-UP FOR MONITORS:

CHA-OUT CH A - IN

CHB-OUT

CH B - IN

FBX SET-UP FOR ENTIRE MIX:
All other signal processing equipment Right Send

Left Send

All other signal processing equipment
FBX SET-UP FOR SINGLE INSERT POINT: MIXER Input Channel 2

CHA-OUT

CH A - IN

HIGH Z

INSERT

1/4" TS plug (R) Insert Y-cord 1/4" TRS plug

1/4" TS plug (T)

MIXER Input Channel 1
FBX SET-UP FOR INSERT SEND & RETURN:

MIXER Input Channel 2

INSERT RETURN

INSERT SEND

Use 1/4" TRS plug for balanced sends/inserts. Use 1/4" TS plug for unbalanced sends/inserts.

OPERATING INSTRUCTIONS

Before You Begin
The FBX automatic feedback controller will improve any sound reinforcement system. By following these suggestions, you will be assured of the most benefit from your FBX enhanced sound system. The instructions presume that you are familiar with the fundamentals of sound reinforcement.
Where the FBX fits in your sound system: Place the FBX anywhere in the sound system that a graphic equalizer might be used to control feedback. The most common place is between the output of the mixer and the input of a power amp. In this position, the FBX can sense and eliminate feedback occurring in any channel of the mixer. The FBX can also be used on a mixer insert point for a single channel, or a sub-group (see diagrams on pages 5-6). Note: If youre using a mixer with unbalanced 1/4" outputs, you must use standard unbalanced cables and connectors when connecting it to the FBX. Similarly, if your mixer is wired for balanced 1/4" (Tip/Ring/Sleeve) outputs, you must use that type of connector. If you dont, you may experience a loss of gain when using the FBX. The FBX is designed for balanced output. If either side of the balanced output is grounded at any point, a 6 dB loss in dynamic range may occur (+21 dBV max. signal level unbalanced; +27dBV max. signal level balanced). A note about graphic equalizers: The FBX is designed to replace the graphic equalizers function for eliminating feedback. In READ THIS many applications, such as churches, auditoriums or small acoustic ensembles, the mixing board provides all the tonal control that is necessary. The FBX can replace the graphic EQ altogether in some applications, however, a graphic equilizer may be beneficial to shape a system's total performance. If you do want to use an equalizer, place the FBX after the EQ in the signal path. Use the EQs controls to shape the tonal response of the sound system, but DO NOT NOTCH FOR FEEDBACK. Understanding FIXED and DYNAMIC filters: Before operating the FBX, you need to understand READ THIS the two types of FBX filters: FIXED and DYNAMIC. FIXED FILTERS retain their frequency center-points until the unit is reset by the user. The systems gain before feedback is limited primarily by the number of fixed filters; i.e., increasing the number of fixed filters increases the systems gain before feedback. The FBX's DYNAMIC FILTERS control intermittent feedback that comes and goes throughout the program. They are continually reset automatically to different frequencies as new feedback occurs during the program. For most applications, the optimal setting is nine FIXED and three DYNAMIC FILTERS. This is the factory default. ClipGuard Adaptive Clip Level Control: Your FBX2020-Plus has a powerful new feature: Sabine's patented ClipGuard adaptive clip level control. Until Sabine invented ClipGuard, engineers had to set audio equipment input and output levels to a compromised setting that allowed too much noise in quiet programs and risked clipping during high-level programs. With ClipGuard, no front panel program level control is needed. It automatically matches the FBX2020Plus internal dynamic range to the constantly changing program level and maintains unity gain. ClipGuard extends the effective dynamic range of your FBX2020-Plus from 100dB to 105dB! 6 7

ClipGuard TURBO Mode Guide
What is TURBO mode? TURBO mode speeds up the FBX filter initialization process so that it takes only a few seconds, and it greatly reduces the volume level of the feedback during setup. If the red CLIP LED flashes when no other signal level LEDs are on, TURBO is on. TURBO turns off automatically after the first dynamic filter is set, or you can turn it off manually by pressing the LOCK FIXED button. (Press it again to unlock the filters.) NO! TURBO mode should be turned off either automatically or manually before your program begins. If left on, the 1020Plus will clip, may set FBX filters improperly.
How do I know TURBO is on? How do I turn off TURBO?
Can the 1020Plus work during the program with TURBO on?
Why won't all the If you press LOCK FIXED to turn off TURBO fixed filters set? mode before all the fixed filters have been set, and you want to use the rest of the fixed filters, press LOCK FIXED again right away before a dynamic filter sets. Once a dynamic filter sets, you will not be able to use the rest of the fixed filters unless you reset and start the initialization again.
ClipGuard incorporates TURBO mode setup, another new feature. It cuts the time for FBX filter initialization to just a few seconds, and it greatly reduces the volume level of the feedback during setup. The FBX2020-Plus is set in TURBO mode at the factory and automatically engages every time you press RESET or SET TOTAL NO. (to reset filters or set total number of filters). The FBX2020-Plus automatically returns to normal program mode when the first dynamic filter is set or when you press the front panel LOCK FIXED button. ALL FILTER LEDS WILL CYCLE TO INDICATE THE FBX IS ABOUT TO EXIT TURBO MODE. NOTE: If you press LOCK FIXED to turn off TURBO mode before all the fixed filters have been set, and you want to use the rest of the fixed filters, press LOCK FIXED again right away -- before a dynamic filter sets. Once a dynamic filter sets, you will not be able to use the rest of the fixed filters unless you reset and reinitialize the unit. WARNING: Follow the setup procedure outlined in the next section, and do not play program during TURBO set-up mode. Otherwise, the FBX2020-Plus will clip and may set FBX filters improperly. (Clip level is set to the lowest level so the feedback clips quickly; therefore, your program will also be clipped in TURBO mode. Be sure a dynamic filter is set, and if one isn't, press the LOCK FIXED button before your program begins.) You'll know the 2020Plus is in TURBO mode if the red CLIP LED flashes when no other signal level LEDs are on. NOTE: Any loud sounds picked up by open micrphones while TURBO is engaged may cause FBX filters to set. For this reason we recommend maintaining silence as much as possible during the short time TURBO is engaged. If your venue is too noisy to take advantage of TURBO mode, turn off TURBO by pressing LOCK FIXED on, then off before you initialize for feedback. Remember: if you leave LOCK FIXED on, the fixed filters wont initialize. The LED indicating LOCK FIXED should be off when initializing.

Reset Options The Reset button has two functions: You can reset all the FBX filters, or just the Dynamic Filters. Hold the reset button in and all the filter LEDs will begin flashing. To clear only the Dynamic filters, release the Reset button when the Dynamic filter LEDs go off (after three flashes). To clear all the filters, do not release the Reset button until all the filters LEDs go off. A full reset is recommended whenever you change speaker or microphone positions. NOTE: Factory default is 9 Fixed and 3 Dynamic filters, so if you reset Dynamics only those three lights will go out during reset. And remember, whenever you perform a full reset you will automatically be in TURBO mode. WARNING: Do not reset all filters during the program. This releases all the feedback you eliminated during setup. Use extreme caution when resetting the Dynamic filters, because you may need those filters at that moment during the show.
9. Now lower the master volume slightly so that the system is not on the verge of another feedback point. This is the maximum volume level that the FBX will be able to provide. Higher levels will cause uncontrollable feedback. 10. We recommend you press LOCK FIXED to lock the Fixed filters at their current depth. See the Features section below for a complete explanation. 11. Channels A and B must be set individually and separately. To set the second channel, turn down the volume for the first channel, then bypass the first channel and repeat this system initializing procedure. 12. Youre ready to go. Make sure TURBO mode is off (clip LED not flashing). ClipGuard will automatically match the input level to the best internal dynamic range.
How To Use FBX2020-Plus Features
Using the LOCK FIXED feature: In rare situations the FBX may mistake music for feedback and drive the fixed filters deeper than necessary, such as in a church with a pipe organ or during a performance with a great deal of intentional sustained electric guitar feedback. You can prevent the fixed filters from deepening beyond their preset depth by pressing the LOCK FIXED button on the front panel. The LOCK FIXED LED will light to indicate that the FBX is in LOCK FIXED mode. The fixed filters will stay locked until you press the LOCK FIXED button again. The dynamic filters are not affected. Selecting filter width: If youre using the FBX for a music application, the standard 1/10octave constant Q filter is most effective. However, in spoken word applications, such as lectures or teleconferencing, we recommend using the wider 1/5-octave filter for more robust feedback control. You may enable the 1/5-octave filters by pressing the FIFTH OCTAVE button, and the built-in LED will light. Only filters set after pressing the button in will be 1/5-octave. Press the button again to set subsequent filters to standard 1/10octave filters.

Important Operating Considerations
Memory: The FBX stores the positions and depths of the filters in nonvolatile internal memory when the unit is turned off or during a power failure. The unit will return all filters to their previous frequencies and depths when it is turned back on. Bypass Mode: The FBX has a true power-off bypass. The signal is unaffected in BYPASS MODE even if the unit is turned off. Please note that if a combination of BALANCED and UNBALANCED inputs and outputs is used, the signal may be disconnected or attenuated in BYPASS MODE. Resetting the filters: You must reset the FBX if the microphones or speakers are moved significantly. To reset the unit, place the PA systems master volume to minimum and then press the reset button until all the FILTER LEDs stop flashing. Then follow the system initialization procedure explained previously. Or you can reset only the Dynamic filters by pressing and releasing the reset button after the Dynamic filter LEDs stop flashing. This may be useful in certain situations, for example, after extensive wireless microphone use.

TURBO MODE SETUP

The FBX2020-Plus incorporates TURBO mode setup, which is indicated by a flashing red CLIP LED. This lightning-quick setup feature cuts the time for FBX filter initialization to just a few seconds, and it reduces the volume level of the feedback during setup. The 2020Plus is set in TURBO mode at the factory and automatically engages every time you press RESET (resetting filters). The 2020Plus automatically returns to normal program mode when the first dynamic filter is set or when you press the front panel LOCK FIXED button. ALL FILTER LEDS WILL CYCLE TO INDICATE THE FBX IS ABOUT TO EXIT TURBO MODE.

TROUBLESHOOTING TIPS

Q. Can I place the FBX in the mixers EQ loop? A. Yes. Q. Can I place the unit in the mixer effects loop? A. Avoid this configuration. You can configure the system this way only if each effects send of each mixer channel is set so that all of the signal is routed completely through the effects loop. You cannot mix dry signal with effects signal and still control feedback. Q. The signal input LEDs do not light. The unit will not catch feedback. Why? A. The unit is not in the signal path. Check the connections. Be sure that the program is interrupted when the input is disconnected from the back of the unit. Q. Can I mix balanced and unbalanced inputs and outputs? A. Yes. An unbalanced input and balanced output is compatible. However, a balanced input and unbalanced output may result in a 6 dB loss of dynamic range, and the bypass function may not operate correctly. Q. Why does one of the FILTER ACTIVITY LEDs blink? A. The last filter to be automatically updated blinks. During normal operation, the blinking will move from filter to filter as they are reset. This gives the user a visual confirmation that the unit is responding to new feedback and is functioning properly. Q. Sometimes during the initial set-up, the first filter LED will blink before any feedback has been introduced into the system. Why? A. The FBX will set a filter if the system has a hum. Check for bad grounds. Try resetting the filters and/or the Ground switch on the rear panel. Q. Why does the FBX cause a noticeable hum? A. It hums if the main power voltage drops significantly below 10% of the specified voltage. Check the A/C power mains. Q. Why does my system sound thin and muffled? A. Place the FBX in BYPASS MODE. If the system still sounds thin, your problem is probably improper use of a graphic EQ. If the problem is really the FBX, reinitialize the system. Q. Why does my program sound clipped and distorted? A. Make sure the FBXs TURBO mode has turned off before your program. Check the signal level ladder. If the red CLIP LED lights with no other signal level LEDs lit, the FBX2020-Plus is still in TURBO mode. TURBO mode turns off automatically after the first dynamic filter is set, or you can turn it off manually by pressing the LOCK FIXED button. Q. Can I patch two FBX2020-Plus channels together for twice the filters? A. Yes; connect the output of the FBX2020Pluss channel A to the input of the 2020Pluss channel B. Place the 2020Plus between the output of the mixer and the input of a power amp, and set up the channels sequentially. Bypass channel B while setting up channel A, then lock channel As fixed filters (all channel As filters should be fixed) by pressing channel As LOCK FIXED button on the front panel after set-up. Q. Why doesn't the FBX2020-Plus filter feedback immediately? A. 1. Lower frequencies may take longer than higher ones. 2. Check input level of signal at the unit and reconfigure gain so the signal level LED's on the unit light up. 3. It may be patched in an "effects loop", not directly in the signal path.This WILL NOT WORK. 4. You may have used all 12 filters. Dynamic filters will continue to operate by notching feedback frequencies as they occur, but ultimately, gain will exceed filter capacity.

WARNING: TURBO Mode will cause distortion in your audio program it is for setup only. You must follow the setup procedure outlined in the previous section, and do not play program during TURBO setup mode. Otherwise the 2020Plus will clip, and filters may be set improperly. (Clip level is set to the lowest level so the feedback clips quickly; therefore, your program will also be clipped in TURBO mode. Be sure a dynamic filter is set, and if one isnt, press the LOCK FIXED button before your program begins.) Youll know the 2020Plus is in TURBO mode if the red CLIP LED flashes when no other signal level LEDs are lit. You can manually override TURBO mode if necessary: Press LOCK FIXED (the LOCK FIXED light will turn on), then press it again. (LOCK FIXED light will go out).
MOBILE vs. STATIONARY MICROPHONES
One significant advantage offered by the Sabine family of FBX feedback eliminator products is their ability to adapt to changing acoustical relationships involving sound system components and various user applications. One major source of potential feedback problems arises in situations with wireless microphones, when the user of the wireless mic is moving around the stage/auditorium. As a microphone moves in a sound space, with varying degrees of proximity to the speakers and varying acoustic responses, feedback frequencies may shift. In such a situation, feedback-free mobility may be more important a concern than maximum system gain.
One method of setting FBX filters with mobile microphones is to turn a microphone on and walk around to the various possible microphone locations. At the same time, raise the system gain and set the FBX filters one at a time. In some situations, raising the number of dynamic filters (versus fixed FBX filters) may allow a second layer of defense against new feedback from new locations. However, in many mobile microphone set ups, fixed FBX filters will protect against feedback across the range of microphone mobility.
FBX2020-Plus ENGINEERING SPECIFICATIONS
FILTERS 12 independent digital notch filters per channel, controlled automatically from 40 Hz to 20 KHz. Filter width: user-controllable - either 1/10 or 1/5 octave, constant "Q" Resolution: 1/50 octave from 100 Hz to 20 KHz * Time required to find and eliminate feedback: 0.4 seconds, typical @ 1KHz Total number of combined filters active per channel: user selectable, from 1 to 12 Number of dynamic vs. fixed filters per channel: user selectable LAST CONFIGURATION STORED IN MEMORY INPUT/OUTPUT** Input/Output Maximum Signal Levels: Balanced +27dBV peak, unbalanced +21 dBV peak Output Drive: Unit will perform as specified driving a load >600 Ohms Input Impedance: Balanced or unbalanced >10K Ohms, PIN 2 high Output Impedance: Balanced or unbalanced 10 Ohms nominal, PIN 2 high Bypass: True power off bypass Headroom: +23dB peak @ 4dBV nominal input, balanced I/O Connectors: XLR-3 and 1/4" TRS PERFORMANCE*** Spectral Variation: +.25 dB, 20Hz to 20 KHz SNR: >100 dB, typical, "A" weighted THD: <0.02% @ 22 dBV sine wave at 1 KHz Dynamic Range: >105 dB with ClipGuard automatic clip level control active POWER INPUT Factory configured to either 115 VAC or 230 VAC. 50/60 Hz, 12 Watt input. FUSE REPLACEMENT To reduce the risk of fire, replace only with 5x20 mm,.315 A, 250 V, fast-acting fuse. MEMORY BATTERY LIFE 7 years, typical DIMENSIONS 1-U rack mount; 19 x 1.75 x 8.0 ins. nominal (rack mountable); 48.3 x 4.5 x 20.3 cm nominal (rack mountable) WEIGHT 8.0 lbs. (3.6 kg) nominal OPERATING TEMPERATURE Safe operating temperature: 0 - 50 degrees centigrade ambient temperature (32 - 120F)

*Below approximately 200 Hz the feedback filters become slightly wider to increase the feedback and rumble capture speed at these low frequencies. **(Note: Inputs may be balanced or unbalanced. For maximum output capability, outputs must be balanced (XLR or TRS). If either side of an output is grounded, the peak output and dynamic range will be reduced by 6 dB. *** Tests performed using an Audio Precision System One model 322 or equal.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
FBX-2020Plus SIMPLIFIED INTERNAL BLOCK DIAGRAM

Analog/Digital Converter

ADC Automatic Clip Level Adjustment
DSP Feedback Detection Center Frequency - Depth Control

Digital/Analog Converter

DAC Automatic Clip Level Adjustment

Filter 1

Filter 2

Filter 11

Filter 12
1/5 or 1/10 Octave Filters

Bypass Switch

OUTPUT
Cautions & Warranty CAUTION
EXPOSURE TO EXTREMELY HIGH NOISE LEVELS MAY CAUSE A PERMANENT HEARING LOSS. INDIVIDUALS VARY CONSIDERABLY IN SUSCEPTIBILITY TO NOISE INDUCED HEARING LOSS, BUT NEARLY EVERYONE WILL LOSE SOME HEARING IF EXPOSED TO SUFFICIENTLY INTENSE NOISE FOR A SUFFICIENT TIME. THE U.S. GOVERNMENTS OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION (OSHA) HAS SPECIFIED THE FOLLOWING PERMISSIBLE NOISE LEVEL EXPOSURES: DURATION/DAY IN HOURS 2 1-1/1/2 1/4 or less SOUND LEVEL IN dBA, SLOW RESPONSE 115

CAUTION

This apparatus contains a lithium battery. Replacement shall be made by qualified service personnel only. Call Sabine at (386) 418-2000 or consult an authorized Sabine agent. FBX and FBX Feedback Exterminator are registered trademarks of Sabine, Inc., and are the brand names of its line of automatic feedback controllers. Covered by U.S. Patent No. 5,245,665, Australian Patent No. 653,736, Canadian Patent No. 2,066,624-2, German Patent No. 69118486.0, and U.K. Patent No. 0486679. Other patents pending. Real-Q and Real-Q2 are protected by U.S. Patent No. 5,506,910. Other patents pending. Graphi-Q, Power-Q, Real-Q, and Real-Q2 are trademarks of Sabine, Inc. Copyright 2003. All rights reserved.
ACCORDING TO OSHA, ANY EXPOSURE IN EXCESS OF THE ABOVE PERMISSIBLE LIMITS COULD RESULT IN HEARING LOSS. EAR PLUGS OR PROTECTORS IN THE EAR CANALS OR OVER THE EARS MUST BE WORN WHEN OPERATING THIS DEVICE IN ORDER TO PREVENT A PERMANENT HEARING LOSS, IF EXPOSURE IS IN EXCESS OF THE LIMITS AS SET FORTH ABOVE. TO ENSURE AGAINST POTENTIALLY DANGEROUS EXPOSURE TO HIGH SOUND PRESSURE LEVELS, IT IS RECOMMENDED THAT ALL PERSONS EXPOSED TO EQUIPMENT CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS SUCH AS THIS DEVICE BE PROTECTED BY HEARING PROTECTORS WHILE THIS UNIT IS IN OPERATION.

Limited Warranty

THIS LIMITED WARRANTY VALID ONLY WHEN PURCHASED AND REGISTERED IN THE UNITED STATES OR CANADA. ALL EXPORTED PRODUCTS ARE SUBJECT TO WARRANTY AND SERVICES TO BE SPECIFIED AND PROVIDED BY THE AUTHORIZED DISTRIBUTOR FOR EACH COUNTRY. Ces clauses de garantie ne sont vaiables quaux Etats-Unis et au Canada. Dans tous les autres pays, les clauses de garantie et de maintenance sont fixees par le distributeur national et assuree par lui selon la legislation en vigueur. Diese Garantie ist nur in den USA and Kanada gultig. Alle Export-Produkte sind der Garantie und dem Service des Importeurs des jewelligen Landes untervorfen. Esta garantia es valida solamente cuando el producto es comprado en E.U. continentales o en Canada. Todos los productos que sean comprados en el extranjero, estan sujetos a las garantias y servicio que cada distribuidor autorizado determine y otrezca en los diferentes paises. ONE-YEAR LIMITED WARRANTY/REMEDY SABINE, INC. (SABINE) warrants this product to be free from defects in material and workmanship for a period of one (1) year from date of purchase PROVIDED, however, that this limited warranty is extended only to the original retail purchaser and is subject to the conditions, exclusions and limitations hereinafter set forth: CONDITIONS, EXCLUSIONS AND LIMITATIONS OF LIMITED WARRANTIES These limited warranties shall be void and of no effect if: a. The first purchase of the product is for the purpose of resale; or b. The original retail purchase is not made from an AUTHORIZED SABINE DEALER; or c. The product has been damaged by accident or unreasonable use, neglect, improper service or maintenance, or other causes not arising out of defects in material or workmanship; or d. The serial number affixed to the product is altered, defaced or removed; or e. The power supply grounding pin is removed or otherwise defeated. In the event of a defect in material and/or workmanship covered by this limited warranty, Sabine will repair the defect in material or workmanship or replace the product, at Sabines option; and provided, however, that, in any case, all costs of shipping, if necessary, are paid by you, the purchaser. THE WARRANTY REGISTRATION CARD SHOULD BE ACCURATELY COMPLETED, MAILED TO AND RECEIVED BY SABINE WITHIN FOURTEEN (14) DAYS FROM THE DATE OF YOUR PURCHASE. In order to obtain service under these warranties, you must: a. Bring the defective item to any Authorized SABINE DEALER and present therewith the ORIGINAL PROOF OF PURCHASE supplied to you by the AUTHORIZED SABINE DEALER in connection with your purchase from him of this product. If the DEALER is unable to provide the necessary warranty service, you will be directed to the nearest other SABINE AUTHORIZED DEALER which can provide such service. OR b. Ship the defective item, prepaid, to: SABINE, INC. 13301 HIGHWAY 441 ALACHUA, FL 32615-8544

including therewith a complete, detailed description of the problem, together with a legible copy of the original PROOF OF PURCHASE and a complete return address. Upon Sabines receipt of these items: If the defect is remedial under the limited warranties and the other terms and conditions expressed have been complied with, Sabine will provide the necessary warranty service to repair or replace the product and will return it, FREIGHT COLLECT, to you, the purchaser. Sabines liability to the purchaser for damages from any cause whatsoever and regardless of the form of action, including negligence, is limited to the actual damages up to the greater of $500.00 or an amount equal to the purchase price of the product that caused the damage or that is the subject of or is directly related to the cause of action. Such purchase price will be that in effect for the specific product when the cause of action arose. This limitation of liability will not apply to claims for personal
injury or damage to real property or tangible personal property allegedly caused by Sabines negligence. Sabine does not assume liability for personal injury or property damage arising out of or caused by a non-Sabine alteration or attachment, nor does Sabine assume any responsibility for damage to interconnected non-Sabine equipment that may result from the normal functioning and maintenance of the Sabine equipment. UNDER NO CIRCUMSTANCES WILL SABINE BE LIABLE FOR ANY LOST PROFITS, LOST SAVINGS, ANY INCIDENTAL DAMAGES OR ANY CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PRODUCT, EVEN IF SABINE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITED WARRANTIES ARE IN LIEU OF ANY AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR USE; PROVIDED, HOWEVER, THAT IF THE OTHER TERMS AND CONDITIONS NECESSARY TO THE EXISTENCE OF THE EXPRESS LIMITED WARRANTIES, AS HEREINABOVE STATED, HAVE BEEN COMPLIED WITH, IMPLIED WARRANTIES ARE NOT DISCLAIMED DURING THE APPLICABLE ONE-YEAR PERIOD FROM DATE OF PURCHASE OF THIS PRODUCT. SOME STATES DO NOT ALLOW LIMITATION ON HOW LONG AN IMPLIED WARRANTY LASTS, OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATIONS OR EXCLUSIONS MAY NOT APPLY TO YOU. THESE LIMITED WARRANTIES GIVE YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH MAY VARY FROM STATE TO STATE. THESE LIMITED WARRANTIES ARE THE ONLY EXPRESS WARRANTIES ON THIS PRODUCT, AND NO OTHER STATEMENT, REPRESENTATION, WARRANTY OR AGREEMENT BY ANY PERSON SHALL BE VALID OR BINDING UPON SABINE. In the event of any modification or disclaimer of express or implied warranties, or any limitation of remedies, contained herein conflicts with applicable law, then such modification, disclaimer or limitation, as the case may be, shall be deemed to be modified to the extent necessary to comply with such law. Your remedies for breach of these warranties are limited to those remedies provided herein, and Sabine gives this limited warranty only with respect to equipment purchased in the United States of America. INSTRUCTIONS-WARRANTY REGISTRATION CARD 1. Mail the completed WARRANTY REGISTRATION CARD to: SABINE, INC. 13301 HIGHWAY 441 ALACHUA, FL 32615-8544 a. Keep the PROOF OF PURCHASE. In the event warranty service is required during the warranty period, you will need this document. There will be no identification card issued by Sabine, Inc. 2. IMPORTANCE OF WARRANTY REGISTRATION CARDS AND NOTIFICATION OF CHANGES OF ADDRESS: a. Completion and mailing of WARRANTY REGISTRATION CARDS - Should notification become necessary for any condition that may require correction, the REGISTRATION CARD will help ensure that you are contacted and properly notified. b. Notice of address changes - If you move from the address shown on the WARRANTY REGISTRATION CARD, you should notify Sabine of the change of address so as to facilitate your receipt of any bulletins or other forms of notification which may become necessary in connection with any condition that may require dissemination of information or correction. 3. You may contact Sabine directly by telephoning (386) 418-2000. 4. Please have the Sabine product name and serial number available when communicating with Sabine Customer Service.

Warning! This equipment must be earthed. Caution! Risk of electric shock. Do not open. Caution! Shock hazard. Do not remove covers. No user serviceable parts inside. Refer servicing to qualified service personnel. Warning! To reduce the risk of fire or electric shock, do not expose this product to rain or moisture.
Attention! Cet appareil doit tre reli la terre. Attention! Risque de choc lectrique; ne pas ouvrir. Attention! Risque de choc; ne pas oter les capots. Aucune pice accessible l'intrieur. S'addresser un technicien qualifi. Attention! Pour rduire le risque d'incendie ou de choc lectrique, ne pas laisser l'appareil sous la plouie ou l'humidit. Achtung! Dieses Gert muss schutzgeerdet sein. Achtung! Gefar eines elektrischen Stormschlags. Gehause nicht ffnen. Achtung! Gefar eines elektrischen Stormschlags. Gehuse nicht ffnen. Keine con Benutzer zu bedienenden Teile im Gerteinneren. berlassen Sie das Gert zu Servicezwecken nur geschultem Fachpersonal. Um Brandgefar oder das Risiko eines elektrischen Schlags auszuschlieen, das Gert vor Nsse und Feuchtigkeit schtzen. Advertencia! Este equipo debe estar conectado a tierra. Precaucin! Reisgo de descarga elctrica. No abrir. Precaucin! Riesgo de descarga elctrica. No desmontar las tapas. Piezas interiores no reparables por el usuario. Reparable slo por personal cualificado. Advertencia! Para reducir el riesgo de incendio o de descarga elctrica no exponga este producto a la lluvia o humedad. FCC Statement: This device complies with Part 15 of the FCC Rules. Operation is subject to the following conditions: (1) This device may not cause harmful interference; and (2) This device must accept any interference received, including interference that may cause undesired operation. Warning: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio TV technician for help. Canadian Compliance Statement This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications. Le present appareil numerique n'emet pas de bruits radioelectriques depassant les limites applicables aux appareils numeriques de la class B prescrites dans le Reglement sur le brouillage radioelectrique edicte par le ministere des Communications du Canada. Japanese EMI Compliance Statement 1. 2. 3. 4. 5. 6.

12. 13.
15. The user should not attempt to service this equipment. All service work should be done by a qualified service technician. OSHA 2201; 1995 revised.
Register your FBX2020-Plus online at Sabine.com

MADE IN USA

Manufactured by: Sabine, Inc. 13301 NW US Highway 441 Alachua, Florida 32615-8544 USA Phone: (386) 418-2000 Fax: (386) 418-2001 www.Sabine.com