Reference Manual

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Table Of Contents

Introduction...3

Welcome!.... 3

DEQ230 Key Features... 4 How to Use This Manual... 5
Important Safety Instructions..7
Important Safety Instructions (English).. 7
Safety symbols used in this product.. 7 Please follow these precautions when using this product:. 7
Instructions de Scurit Importantes (French).. 9
Symboles utiliss dans ce produit... 9 Veuillez suivre ces prcautions lors de lutilisation de lappareil:.... 9
Lesen Sie bitte die folgende Sicherheitshinweise (German)... 11
Sicherheit Symbole verwendet in diesem Produkt.. 11 Folgen Sie bitte diesen Vorkehrungen, wenn dieses Produkt verwendet wird:... 11
CE Declaration Of Conformity... 13 FCC Compliance Statement.. 13
Chapter One: Quick Start Guide..15
If you can't wait to get started... 15
Step 1: Hook it up to a mixer... 15 Step 2: Try some equalization.. 16 Step 3: Store the Program... 16
Chapter Two: Connections..19
Unpacking and Inspection.. 19 Installing in a Rack.. 19 Thermal Considerations in Rack Mounting.. 19 AC Power Hookup... 20
To use the DEQ230 in another country:.. 20
Connecting Inputs and Outputs.. 21
Connecting to the Channel or Main Inserts of a mixing console.... 21 Connecting to the inserts on an instrument amplifier. 23 Connecting to equipment with XLR inputs and outputs. 23 Connecting to equipment with S/PDIF inputs and outputs (DEQ230D only)... 23

About Audio Cables.. 25

Chapter Three: Basics of Equalization.27
What is equalization?... 27 Description of the Controls... 28 Description of the Basic Modes... 29 Basic operation: Program mode.. 31 Basic operation: Edit mode... 32
Basic operation: Store mode.. 38

Channel Copy.... 39

Basic operation: Audition mode.. 40 Basic operation: Channel Level mode.. 42 The "Hidden" Modes.. 43
Demonstration mode... 43 Real-time Analysis mode (DEQ230D only):.. 43 Setup mode... 44 Button combinations.... 49
Equalization Artifacts... 50 Constant Q vs. Variable Q... 51
Chapter Four: Applications..55

Filtering effects... 56

Chapter Five: Program Charts..59
DEQ230 Settings Chart... 69
Chapter Six: Troubleshooting..71
Restoring the Factory Programs & Defaults.. 71 Line Conditioners and Protectors... 71 Care and Maintenance.. 71
Troubleshooting Index... 72 Specifications..75 Audio Performance... 75 Mechanical.... 75
Warranty/Contact Alesis..77
Alesis Limited Warranty.... 77 Alesis Contact Information... 78

Introduction

Welcome!
Thank you for purchasing the Alesis DEQ230. It is a versatile product, and whether it becomes a part of your studio or finds its place in your live setup, we know it will serve you well. Since 1984, we've been designing and building creative tools for the audio community. We believe in our products, because we've heard the results that creative people like you achieve with them. One of Alesis' goals is to make high-quality music technology available to everyone. This Reference Manual is an important part of that, because in it we try to present the DEQ230s features in a way that is easy to understand and remember. But even beyond explaining each feature and parameter, this manual can be a key that unlocks an application for the DEQ230 that you may not have considered. So we try to write our manuals as carefully as we build our products. The goal of this manual is to get you the information you need as quickly as possible, with a minimum of hassle. We hope we've achieved that. If not, please drop us an email and give us your suggestions on how we could improve future editions of this manual. We hope your investment will bring you many years of creative enjoyment and help you achieve your goals. Sincerely, The people of Alesis

Except as noted, when this user guide refers to the DEQ230 we will be referring to both the DEQ230 and the DEQ230D.
For more effective service and product update notices, please register your DEQ230 online at: http://www.alesis.com/ support/warranty.htm

DEQ230 Key Features

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. Offers the best of digital technology and analog-style control: a graphic display with instant editing of any band or combination of bands, plus the ability to store programs 60 programs total: 30 preset and 30 user-programmable 48 KHz sampling rate, 24-bit A/D/A, 28-bit internal processing Two channels of equalization, independent or linkable 30 EQ bands per channel, spanning 25 Hz-20 KHz in 1/3octave increments +/- 12 dB boost/cut with center detente Constant Q technology for finer control of audio LOCK function for "set and forget" situations, which prevents accidental reprogramming AUDITION mode for automated program comparison Individual Channel Level adjustment per program Master Level adjustment [LINK] button for quick creation of matched EQ curves [BYPASS] button Configurable editing modes to suit the way you work Several methods of accelerated program selection Ability to copy settings from Channel A to Channel B during Store procedure Easy-to-read 7-segment Numeric LED Display Over 750 Band Gain LEDs, making it easy to read EQ curves from a distance SIGNAL and CLIP LEDs Balanced input/impedance-balanced output (TRS) Compact 1-space rackmount profile
DEQ230D only: 22. Real-time Analysis (RTA) mode for visual feedback of incoming audio signal, with selectable metering modes 23. S/PDIF input/output, auto-senses incoming digital audio 24. Clock selectable between 44.1k and 48k sampling rates 25. MIDI in/out for program changes and sys-ex storage 26. Balanced input/output (TRS) 27. +4/-10 operating level switch (rear panel) For full operating specifications, see page 75.

How to Use This Manual

Remember: if one or both of the red LEDs light up, that means the signal is clipping. To prevent this, reduce the level being sent to the proper channel.
Step 3: Store the Program
Once you have created an interesting program, you can save it to one of the 30 User program locations. Heres how to do this: 1. Press the [STORE] button to enter Store mode. 2. Use the [DOWN/UP] buttons to select the new location for the edited program. For your convenience, programs 55-59 have been left blank so you can store your editing experiments somewhere without fear of overwriting a program you might want to use later. 3. Press the [STORE] button again to store the program to the new location. For a detailed explanation on how to use this mode, see page 38.
Programs 55-59 have been left blank so you have places to store your new programs right away.

2 Connections

Unpacking and Inspection
Your DEQ230 was packed carefully at the factory. The shipping carton was designed to protect the unit during transit. Please keep this carton in the highly unlikely event that you need to return the DEQ230 for servicing. The shipping carton should contain the following items: DEQ230 with the same serial number as shown on shipping carton A/C power supply adapter (DEQ230 only) A/C power cable (DEQ230D only) This instruction manual

Installing in a Rack

The DEQ230 may be simply set on a table, or installed in a standard 19" audio equipment rack.
Thermal Considerations in Rack Mounting
The DEQ230 can be mounted in an equipment rack (occupying one rack space) or placed on a table or shelf. When you install it, keep in mind that heat is the greatest enemy of electronic equipment. Please observe the following: The DEQ230 is designed to perform properly over a range of ambient temperatures from 10 C to +40 C (50 F to 104 F), in up to 80% non-condensing humidity. These are not absolute limits, but Alesis cannot guarantee that the DEQ230 will meet its published specs or remain reliable if operated outside of these ranges. Always allow adequate ventilation behind the DEQ230. Do not seal any enclosure that holds this unit. It is not necessary to leave an empty rack space above or below the DEQ230. However, if your environment is unusually warm and not air conditioned, space between units will help the units run cooler.

If the Numeric LED Display shows Li when you press [BAND SELECT] buttons on Channel B, it means the channels are linked. Either make the edits on Channel A, or return to Program mode and press [LINK/EXIT] to unlink the channels.
After resetting a bands value, you can change the level of that band in 2 dB increments if you hold one of the [DOWN/UP] buttons and press the opposite button repeatedly. This can help you set up a curve with greater accuracy and speed.
Band Gain Cut/Boost Ranges Whether you are cutting or boosting a band, the first 10 dB of change happens in 0.5 dB increments. The last 2 dB of change, going from +/-10 dB to +/-12 dB, happens in increments of 1.0 dB. So as you make the change, the Numeric LED Display will show you values like this: 0.5, 1.0, 1.5, 2.0, 2.5. 9.0, 9.5, 10, 11, 12. Its not possible to show a minus sign in the LED display for negative gain values. So when you're pushing the [DOWN] button, you'll see the same values: 0.5, 1.0, 1.5, 2.0, 2.5. 9.0, 9.5, 10, 11, 12. But if there's any doubt in your mind about which away you're going, the Band Gain LED will clue you in. As soon as you move 0.5 dB away from 0, the LED for that band will change from green to yellow. If you are cutting the frequency, the -2 dB LED will light. If you are boosting the frequency, the +2 dB LED will light. And on it goes until you reach the maximum value in either direction. The resolution of the gain increments is higher than the number of gain LEDs in each band on the front panel can fully display. Therefore, you may make 0.5dB changes to gain and a band's Gain LED may not change. The following table shows the amount of change in dB it takes to light each of the Band Gain LEDs: LED + 12 dB + 10 dB + 8 dB + 6 dB + 4 dB + 2 dB 0 dB - 2 dB - 4 dB - 6 dB - 8 dB - 10 dB - 12 dB Gain change + 12 dB 9.dB 7.5 - 9.0 dB 5.5 - 7.0 dB 3.5 - 5.0 dB 0.5 - 3.0 dB 0 dB 0.5 - 3.0 dB 3.5 - 5.0 dB 5.5 - 7.0 dB 7.5 - 9.0 dB 9.5 - 11 dB - 12 dB
Remember, if you want to keep the edited program, be sure to store it to one of the User locations. For instructions on how to do this, turn to page 38.

One important note, though; Proportional Gain Memory is only temporary. If you have run one or more bands "past" the +/-12 dB limit and then you exit Edit mode for any reason (such as to store the program), the gain value of those bands will be remembered as +/-12 dB (whichever was the value that was last reached for those bands). The Limits of Relative Gain There will be times when the Relative Gain display will not go all of the way up or down to a value of 24. This is because the DEQ230 takes into account the gain setting of all of the bands when an Edit Group is formed. If the highest gain setting of any band in the Edit Group is + 6 dB, then from there down to -12 dB is only 18 dB. So this is the largest number you will see in the Relative Gain display if you run the relative gain value all the way down (see fig. 3 and 4).
Likewise, if the lowest gain setting of any band in this same Edit Group is -4 dB, then the largest number you will see in the Relative Gain display going all the way up is 16 (see fig. 5).
So if you run the Relative Gain display up and down repeatedly with this Edit Group, the display will hit the "ceiling" at 16 and bottom out at 18. The Release Edit Group function Once you have changed the value of the Edit Group, the DEQ230 will react one of two ways to further presses of the [BAND SELECT] buttons. To decide which option suits your working method or circumstance, experiment with the setting for the Release Edit Group function in Setup Mode. If this function is on, the very next [BAND SELECT] button you press after you have changed the level of the Edit Group will "release" all of the previously selected bands. The only band that will be selected is the one you just pressed. You will know this when it happens, because that's the only Band Gain LED that will be blinking. If the Release Edit Group function is off, the next [BAND SELECT] button you press after you have changed the level of the Edit Group will simply add that band to the Edit Group. For a more detailed explanation of the Release Edit Group function, see pages 44 and 45.
Basic operation: Store mode
Once you have created a program you would like to save, press the [STORE] button to enter Store mode. This will cause the Numeric LED Display to blink with the number of the current program. If you were on a Preset program while editing, you will not be able to store the program until you select one of the 30 User program locations as its destination. To do this, use the [DOWN/UP] buttons. If you press the [UP] button first, you will see the Numeric LED Display jump to User program 30, which is the first available User program location. If you press the [DOWN] button first, you will see the Numeric LED Display jump to User program 59, which is the highest-numbered User program location available. If you were already on a User program when you entered Store mode, then using the [DOWN/UP] buttons will call up the next User program. Once you are in the User program area inside Store mode, pressing the [DOWN/UP] buttons allows you to choose a program number between 30-59 as the destination for your edited program. Pressing and holding one of these buttons will cause the unit to scroll progressively faster through the available choices. If you're holding the [DOWN] button, when the unit reaches User program 30 it will "wrap" around to number 59 and continue scrolling downward. Pressing and holding the [UP] button will cause the numbers to scroll in the opposite direction, wrapping from program 59 to program 30 and continuing upward. As in Program mode, there's an even faster way to select the destination program location. If you press and hold the [DOWN] button and then push the [UP] button, the unit will jump to Program 30. If you continue pressing the [UP] button, the DEQ230 will jump forward through the User locations in increments of 10 (40, 50, 30, 40, 50, etc.). Similarly, if you press and hold the [UP] button and then push the [DOWN] button, the unit will jump to Program 30. If you continue pressing the [DOWN] button, the DEQ230 will jump backward through the User locations in increments of 10 (50, 40, 30, 50, 40, 30, etc.). Once you have chosen the location you want, press the [STORE] button again. This will store the program into the user location you selected. Remember, if at any time you decide you do not want to save the edited program, simply press the [LINK/EXIT] button to return to Program mode. Your edited program will still be there, as evidenced by the dot on the right side of the Numeric LED Display. The destination program will not have been overwritten.

Be sure to store any edits you want to keep prior to entering Audition mode. The Audition list only uses Preset programs or programs that have been stored to the User locations.
The [BYPASS] button is also available in Audition mode. You can use it to audition the original signal manually, or you can use program 00 Flat in the Audition list to automate theDEQ230s return to the unprocessed audio signal.
Remember, the very first program is program 00. So if you want to include program 01 in the Audition list, you will need to select the second [BAND SELECT] button from the left. This is because program 01 is the second program in the DEQ230s memory.
If you cant remember what factory curves correspond to each program number, refer to the Program Charts in Chapter 5.

Audition Automation

There are two ways to toggle between the programs in the Audition List: manually and automatically. The DEQ230 defaults to the automatic method, which we call Audition Automation. Once you have finished adding programs to the Audition List, the DEQ230 begins cycling through the programs from left to right. It will start with the currently active program, pause for several seconds, and move on to the next. When it reaches the last program in the Audition List, it will start over again from the first one on the left. Remember that the stack of four LEDs will indicate which program is currently the active one. Also note that you can edit the Audition List by adding or removing programs during the Audition Automation cycle. Its possible to shorten or lengthen the amount of time spent on each program in the Audition List during Audition Automation. Use the [DOWN/UP] buttons for this purpose. The time range is from 1-25 seconds in increments of one second. You will see the value briefly in the Numeric LED Display as you change it, and then the display will resume showing the number of the current program in the Audition List. The Audition Automation time value you select will be remembered even after turning the DEQ230 off and on again. Audition Automation override If you want to hear a certain program again without having to wait for the DEQ230 to cycle through the entire Audition List, simply press and hold that program's [BAND SELECT] button. This will call up that program immediately. And as long as you hold down that [BAND SELECT] button, the DEQ230 will suspend the Audition Automation cycle and stay on that program. Once you release the button, the next program in the Audition List will be called up and the cycle will continue from there.

There are two ways to get out of RTA mode: pressing the 25 Hz and 31.5Hz buttons on Channel A simultaneously, or by pressing the [LINK/EXIT] button.
Held peaks may be reset at any time by pressing the [DOWN] and [UP] buttons simultaneously.

Setup mode

This is where you will find some of the features that govern the way the DEQ230 operates in the other modes. They are what you would call "Global" settings, in that their status is not stored with a program. No matter which program you call up, these settings will not change. And since they make such a big difference in how the unit works, they have been "tucked away" so they wont be altered accidentally. To access Setup mode, first you must turn off the DEQ230. Then turn the unit back on, wait until you see the letters DEQ230 in the display, and then hold down the [STORE] button. After a couple of seconds you will see the word "SETUP" appear in large letters above Channel As [BAND SELECT] buttons. Then the LEDs over Channel A will read "M. LVL," and the LEDs over Channel B will read "+00." The first twelve [BAND SELECT] buttons of Channel A are used to select between the different functions in Setup mode. They are:

Item (button)

1 (25 Hz) 2 (31.5 Hz) 3 (40 Hz) 4 (50 Hz) 5 (63 Hz)
To return to Program mode from Setup mode, press the [LINK/EXIT] button or turn the DEQ230 off and back on.

Function

Master Level Release Edit Group Audition Auto Edit Time Out Lock

Displayed

M. LVL REL E.G. AUD AUTO EDIT T.O. LOCK

Options

+/- 6 dB Off/On Off/On Off/On Off/On

Default Value

0 dB On On Off Off
The following functions are available on the DEQ230D only. 6 (80 Hz) 7 (100 Hz) 8 (125 Hz) 9 (160 Hz) 10 (200 Hz) 11 (250 Hz) 12 (315 Hz) MIDI Channel MIDI Program Chg Sys-Ex Transmit Sys-Ex Receive MIDI Out/Thru Select Sample Rate Select Force Analog Input MIDI CH PRG CHG SND SYX RCV SYX MIDI O/T INT CLOCK INPUT SRC All, 1-16 Off/On Send? Waiting Out/Thru 44.1/48 Auto/Analog ALL On N/A N/A Thru 48 Auto
Note that as you switch from one function to the next that the Numeric LED Display will change to show the number of the selected function.

The [STORE] button may be used to cycle through the functions also.
Here's a description of what each function does. Button 1: Master Level (+/- 6 dB) The Master Level function is one way to customize the DEQ230 to your environment. If the equipment in your setup tends to send very hot signals, you can use this function to prevent the output of the DEQ230 from clipping. When a hot line level signal comes in, the DEQ230 has plenty of headroom to deal with it. But if you perform some radical equalization on this signal, it is possible that the combination of the incoming hot signal plus the equalization you have done may put the signal "over the top" and within range of clipping. The Master Level function allows you to reduce the level of the equalized signal before it reaches the final output stage of the DEQ230. Don't confuse this with the Channel Level settings in Edit mode. The Channel Level settings are stored with the program, and therefore may vary from program to program. The Master Level setting is global; i.e., it is always active and will affect every program. There is a diagram on page 30 that illustrates the relationship between Channel Level and Master Level. To lower or raise the Master Level setting, use the [DOWN/UP] buttons. To reset the value of this function to 0 dB, press the [DOWN] and [UP] buttons at the same time. For an explanation of how to use the Channel Level control feature, see page 42. Button 2: Release Edit Group (On/Off) Of all the Setup features, this is the one that will most affect the way you work with the DEQ230. The Release Edit Group setting determines the behavior of the [BAND SELECT] buttons in Edit mode. For the sake of describing this feature, let's review some things we already know. When you press a [BAND SELECT] button, you enter Edit mode. If you don't press one of the [DOWN/UP] buttons right away, you can keep pressing [BAND SELECT] buttons until you have several of them selected simultaneously. This is called selecting an Edit Group. Once you have selected an Edit Group, you can cut or boost the gain of all of the bands in the Edit Group simultaneously; they will move up or down in proportion to one another. The Release Edit Group feature does not affect these things; this is always how the DEQ230 operates. However, once you make an edit, it makes a big difference whether the Release Edit Group feature is on or off. If it is on, the very next [BAND SELECT] button you press will "release" all of the previously selected bands. The only band that will be selected is the one you just pressed. You will know this when it happens, because that's the only Band Gain LED that will be blinking.

Button 9: System Exclusive Receive (Waiting) As long as this page is active, the DEQ230D will allow an external device such as a computer to transmit a new bank of 30 User programs into its User memory space. Once the external device begins sending the proper sys-ex data, the DEQ230D displays the message Rcving, or receiving. Depending on the speed of the transmission, the transfer can happen so quickly you may not see that message. Either way, when the sys-ex transmission is complete, the DEQ230D will let you know by displaying the message Done. If you change your mind in the middle of the transmission and realize youve loaded in the wrong bank (or worse, you forgot to back up the User programs first), you can interrupt the transmission by pressing the [DOWN] button. But youd better act quickly, as the whole process takes only about one second. And unfortunately, as soon the message Rcving is displayed the DEQ230D begins overwriting programs in the User bank. If you saw that message you will have lost some User programs. But if you interrupted the transmission, you will have managed to save some of the programs. Button 10: MIDI Out/Thru Select (Out/Thru) Sometimes it is necessary to daisy-chain MIDI devices so the MIDI data from one unit will be passed through one or more other pieces of MIDI gear until it is able to reach the last unit in the chain. The DEQ230D will allow you to do that when this function is set to Thru (the default value). The setting on this page will not affect whether or not the DEQ230D will send its memory out the MIDI Out jack. When that command is initiated (Button 8), the sys-ex data will be sent in either case. Button 11: Sample Rate Select (44.1/48) The DEQ230D automatically senses an incoming digital signal through its S/PDIF input and slaves its internal clock to that, whether the rate is 44.1k or 48k. But if you need the DEQ230D to serve as an A/D converter, then it also will need to be the master clock to the receiving device. You may prefer to record the output of the DEQ230D at either 44.1k or 48k. Use the setting of this function to set the internal clock to the desired sample rate. Button 12: Force Analog Input (Auto/Analog) There may be times when you want the DEQ230D to ignore an incoming digital signal, but you dont want to have to reach around to the back of the rack and unplug the cable going into the S/PDIF input. This function will help prevent that tangled spaghetti-mess of cables where no one knows whether the other end is actually hooked up to anything!

3. 4. 5.

DEQ230 Settings Chart

6 Troubleshooting

Restoring the Factory Programs & Defaults
There is a power-up button combination that will restore the DEQ230's User programs to the factory default programs. This same combination of buttons will reset all of the Setup functions to their default values. This procedure is called "reinitializing." To reinitialize the DEQ230, follow these steps: 1. Make sure you really want to erase every program you have stored. That is what reinitializing the unit does. 2. If you haven't already done so, turn off the DEQ230. 3. Turn the unit on while pressing the [DOWN/UP] buttons. 4. When you see the word "RESET" in large letters over the [BAND SELECT] buttons, you may let go of the [DOWN/UP] buttons. After a couple of seconds, the DEQ230 will return to Program mode.
WARNING! Following the procedures in this section will ERASE ALL OF YOUR USER PROGRAMS and replace them with the User programs that shipped with the DEQ230. Please be certain this is what you want to do before going through these steps.
Line Conditioners and Protectors
Although the DEQ230 is designed to tolerate typical voltage variations, in todays world the voltage coming from the AC line may contain spikes or transients. These can cause audible noises, and they can stress your gear and, over time, possibly cause a failure. There are three main ways to protect against this, listed in ascending order of cost and complexity: Line spike/surge protectors. Relatively inexpensive, these are designed to protect against strong surges and spikes, acting somewhat like fuses in that they need to be replaced if theyve been hit by an extremely strong spike. Line filters. These generally combine spike/surge protection with filters that remove some line noise (dimmer hash, transients from other appliances, etc.). A good example is the Isobar series from Tripp Lite.

Care and Maintenance

Cleaning
Disconnect the AC power supply, then use a damp cloth to clean the DEQ230s metal and plastic surfaces. For heavy dirt, use a non-abrasive household cleaner such as Formula 409 or Fantastik. DO NOT SPRAY THE CLEANER DIRECTLY ONTO THE FRONT OF THE UNIT AS IT MAY DESTROY THE LUBRICANTS USED IN THE SWITCHES AND CONTROLS! Spray onto a cloth, and then use the cloth to clean the unit.
Do not spray cleaning solution of any sort onto the front panel of the DEQ230. If a cleaning becomes necessary, spray a recommended cleaning solution onto a cloth first, and use the cloth to clean the front panel.

Troubleshooting

Troubleshooting Index
Symptoms No audio at outputs. Cause No input audio. Bad cables. Destination is turned down. Weak output signal. Input level weak. Output level weak. (Decide which is the case by pressing the Bypass button.) Input level too high. Output level too high. (Decide which is the case by pressing the Bypass button.) Cant edit program, cant select new program. Numeric LED Display keeps flashing Li. DEQ230 is locked. Channel B is linked to Channel A. Solution Test with a known good input. Replace the cables. Check the connections and the level of the mixer or amp to which the DEQ230 is connected. Increase level from source into DEQ230. Boost channel levels of quiet program. Boost Master Level in Setup mode. Reduce input level at source. Reduce gain of problem bands within program. Reduce channel levels of that program. Reduce Master Level in Setup mode. Unlock DEQ230 in Setup mode. Refer to page 46. Edit Channel A Unlink the Channels to allow independent edits to Channel B. Unlock DEQ230 in Setup mode. Refer to page 46. Set Release Edit Group function to On in Setup mode. Turn on power first, then hold down [STORE] button to enter Setup mode. Turn on power first, then press [DOWN/UP] buttons to re-initialize. Change Force Analog Input setting in Setup mode. Ditto.

Clip LED lights often.

Numeric LED Display keeps flashing Lo. Must de-select all bands in order to edit a single band. DEQ230 wont turn on/wont go into Setup mode DEQ230 wont turn on/wont re-initialize Analog input is ignored Digital input is ignored
DEQ230 is locked. Release Edit Group function set to Off. Holding down buttons when turning on power Holding down buttons when turning on power Digital signal present at S/PDIF Input Force Analog Input is set to Analog in Setup mode.
Refer All Servicing to Alesis
We believe that the DEQ230 is one of the best signal processors that can be made using current technology, and should provide years of trouble-free use. However, should problems occur, DO NOT attempt to service the unit yourself unless you have training and experience. Service on this product should be performed only by qualified technicians. NO USER-SERVICEABLE PARTS INSIDE.

Obtaining Repair Service

Before contacting Alesis, check over all your connections, and make sure youve read the manual. Customers in the USA and Canada: If the problem persists, contact Alesis and request the Technical Support department. Make sure you have the units serial number with you. Talk the problem over with one of our technicians; if necessary, you will be given a return authorization (RA) number and instructions on how to return the unit. All units must be shipped prepaid and COD shipments will not be accepted. For prompt service, indicate the RA number on the shipping label. Units without an RA will not be accepted. If you do not have the original packing, ship the unit in a sturdy carton, with shockabsorbing materials such as Styrofoam pellets (the kind without CFCs, please) or "bubble-pack" surrounding the unit. Shipping damage caused by inadequate packing is not covered by the Alesis warranty. Tape a note to the top of the unit describing the problem, including your name and a phone number where Alesis can contact you if necessary, as well as instructions on where you want the product returned. Alesis will pay for standard one-way shipping back to you on any repair covered under the terms of this warranty. Next day service is available for a surcharge. Field repairs are not authorized during the warranty period, and repair attempts by unqualified personnel may invalidate the warranty. Customers outside the USA and Canada: Contact your local Alesis distributor for any warranty assistance. The Alesis Limited Warranty applies only to products sold to users in the USA and Canada. Customers outside of the USA and Canada are not covered by this Limited Warranty and may or may not be covered by an independent distributor warranty in the country of sale. Do not return products to the factory unless you have been given specific instructions to do so. Internet Address: Important information and advice is available on our web site: http://www.alesis.com Email may be addressed to Support@alesis.com.

Specifications

DEQ230D
Analog I/O (switchable) Input connectors: Output Connectors: Switch set to +4: Nominal input level: Maximum input level: Nominal Output Level: Maximum Output Level: Switch set to 10: Nominal input level: Maximum input level: Nominal Output Level: Maximum Output Level: Input impedance: Output Impedance: 2 balanced 1/4 TRS jacks 2 balanced 1/4 TRS jacks +4dBu (-15dBFS) +19dBu (6.9 Vrms) +4dBu (-15dBFS) +19dBu (6.9 Vrms) -10dBV (-16dBFS) +6dBV (2.0 Vrms) -10dBV (-16dBFS) +6dBV (2.0 Vrms) 10k 220
All measurements done over a 22 Hz - 22 kHz range with 1 kHz sine wave at -1dBFS input. Impedances are measured at 1 kHz.

DEQ230

Input connectors: Output Connectors: Nominal input level: Maximum input level: Nominal Output Level: Maximum Output Level: Input impedance: Output Impedance: 2 balanced 1/4 TRS jacks 2 impedance-balanced 1/4 TRS jacks -10dBV (-18dBFS) +8dBV (2.5 Vrms) -10dBV (-18dBFS) +8dBV (2.5 Vrms) 10k 220

Audio Performance

Signal To Noise Ratio: THD+N: Frequency Response: Power Consumption: >96 dB A-Weighted, Analog In to Analog Out <0.005%, Analog In to Analog Out 22-22kHz 0.50dB, Analog In to Analog Out 15 Watts Max (100-240 VAC / 50-60 Hz)

Mechanical

Size: Rack Spaces: Weight: 1.75" H x 19.0" W x 5" D 1 Space 3.0 lbs. (1.4 kg)

Warranty / Contact

Alesis Limited Warranty
ALESIS CORPORATION ("ALESIS") warrants this product to be free of defects in material and workmanship for a period of one (1) year for parts and for a period of one (1) year for labor from the date of original retail purchase. This warranty is enforceable only by the original retail purchaser and cannot be transferred or assigned. For the most effective service, the purchaser should register the purchase on the ALESIS website at http://www.alesis.com/support/warranty.htm. During the warranty period ALESIS shall, at its sole and absolute option, either repair or replace free of charge any product that proves to be defective on inspection by ALESIS or its authorized service representative. In all cases disputes concerning this warranty shall be resolved as prescribed by law. To obtain warranty service, the purchaser must first call or write ALESIS at the address and telephone number available on the Alesis Website to obtain a Return Authorization Number and instructions concerning where to return the unit for service. All inquiries must be accompanied by a description of the problem. All authorized returns must be sent to ALESIS or an authorized ALESIS repair facility postage prepaid, insured and properly packaged. Proof of purchase must be presented in the form of a bill of sale, canceled check or some other positive proof that the product is within the warranty period. ALESIS reserves the right to update any unit returned for repair. ALESIS reserves the right to change or improve design of the product at any time without prior notice. This warranty does not cover claims for damage due to abuse, neglect, alteration or attempted repair by unauthorized personnel, and is limited to failures arising during normal use that are due to defects in material or workmanship in the product. THE ABOVE WARRANTIES ARE IN LIEU OF ANY OTHER WARRANTIES OR REPRESENTATIONS WHETHER EXPRESS OR IMPLIED OR OTHERWISE, WITH RESPECT TO THE PRODUCT, AND SPECIFICALLY EXCLUDE ANY IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY OR OTHER IMPLIED WARRANTIES. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. IN NO EVENT WILL ALESIS BE LIABLE FOR INCIDENTAL, CONSEQUENTIAL, INDIRECT OR OTHER DAMAGES RESULTING FROM THE BREACH OF ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING, AMONG OTHER THINGS, DAMAGE TO PROPERTY, DAMAGE BASED ON INCONVENIENCE OR ON LOSS OF USE OF THE PRODUCT, AND, TO THE EXTENT PERMITTED BY LAW DAMAGES , FOR PERSONAL INJURY. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. THIS CONTRACT SHALL BE GOVERNED BY THE INTERNAL LAWS OF THE STATE OF CALIFORNIA WITHOUT REFERENCE TO CONFLICTS OF LAWS. This warranty gives you specific legal rights, and you may also have other rights required by law which vary from state to state. This warranty only applies to products sold to purchasers in the United States of America or Canada. The terms of this warranty and any obligations of Alesis under this warranty shall apply only within the country of sale. Without limiting the foregoing, repairs under this warranty shall be made only by a duly authorized Alesis service representative in the country of sale. For warranty information in all other countries please refer to your local distributor.

Warranty/Contact

Alesis Contact Information
Alesis Distribution, LLC Los Angeles, CA USA E-mail: Website: support@alesis.com http://www.alesis.com
Alesis DEQ230/DEQ230D Reference Manual Revision A by Randy Lee, with thanks to Mike Murphy Revision B by Randy Lee Copyright 2003, Alesis Distribution, LLC. All rights reserved Reproduction in whole or in part is prohibited. Specifications subject to change without notice. 7-51-0106-B 01/28/2003