X-RACK XR-20 Mixing Consoles

SERIES

Features
12 Mono inputs + 4 Stereo inputs (20 inputs total), all with mic preamps and individual 48 Volt Phantom Power Switches 100mm faders on all inputs and Left, Right, and Mono (center) Outputs. 60mm faders on the 4 subgroups Four-band EQ on all inputs 18dB per octave high pass filters on mono input channels. Insert on all inputs, subgroups, aux outs and L, R & M outputs. 6 Aux buses, selectable pre or post fader in pairs Auxes 1 and 2 are configured as Level/Pan for stereo operation XLR L, R & Mono outputs switchable between Line and Mic level. Internal universal-voltage power supply 1/4" TRS and RCA connectors provided on Alt Output, Monitor Output and Tape Input. Five Year Crest Audio warranty.

Description

Designed for todays demanding applications, the XR-20 is the first in a line of professional Crest Audio X-Series rack mount mixers, which address a wide range of applications. The XR-20 meets the varying needs of project studios, houses of worship, broadcasters, musicians and all facets of live sound reinforcement where it can be used as the primary mixer or as a highly flexible submixer. Crest Audio's console engineering group has drawn from decades of large and medium-format console design to create a compact, feature-filled rack mount mixer that meets or exceeds what all other rack mount mixers offer in terms of quality, reliability and flexibility, regardless of price. AES-suggested grounding procedures are followed, resulting in excellent rejection of RF interference and ground-related noise. XRack mixers exhibit less than +/- 30 degrees of input - to output phase shift, which is significantly better than most other consoles. XLR connectors are used on all primary inputs and outputs, while 1/4" TRS connectors are used for inserts, making it easy to interface with most professional audio gear. As with all of Crest audio's mixing consoles, top quality components and advanced manufacturing techniques are used throughout. This gives us the confidence to include a five-year warranty, guaranteeing years of trouble-free service.

Specifications

X-Rack XR-20 Mixing Consoles

Frequency response

+0/-1dB 20Hz-20kHz ref 1kHz (any input to any output) any output <0.01% THD 20Hz-20kHz @ +15dBu out mic in < 128dBu 20Hz to 20kHz 150 ohm source, 60db gain channel mute>80dB channel routing >80dB channel fader attenuation >90dB aux send attenuation >80dB < +/- 30 degrees, 20Hz to 20kHz mic-in to main out Five Year

Mic-in

XLR 4k ohm balanced max voltage gain to main outs = 98dB >10k Ohms balanced >10k Ohms unbalanced >10k Ohms balanced XLR 100 ohms balanced (switchable between line or mic level) TRS 50 ohms ground compensated XLR & TRS 50 ohms gnd compensated to drive > eight-ohms 17.5" in height (10u) x 19" in width x 4.5" in depth behind panel 30.5 lbs 100 -240 VAC, 50/60 Hz
Crest Audio Inc. 16-00 Pollitt Dr. Fair Lawn, NJ 07410 USA TEL: 201.909.8700 FAX: 201.909.8744 www.crestaudio.com
Line-in XLR and TRS RCA tape input Bus inputs L/R/M outputs

Crosstalk

Group/direct out Aux outputs Headphones Dimensions Weight Internal Power Supply

Phase Shift

Warranty
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications.

owners manual

X-Rack

XR-20 XR-24

rack mount mixers

Important precautions

Save the carton and packing materials! Should you ever need to ship the unit, use only the original factory packing. For replacement packaging, call Crest Audios Customer Service Department directly.
XR-20 / XR-24 owners manual

Service Information

Do not open unit! Opening the unit will expose you to potentially dangerous voltages. There are no user serviceable parts inside. Equipment should be serviced by qualified service personnel when:
A. The equipment has been exposed to rain. B. The equipment does not appear to oper-
This symbol is used to alert the operator to follow important procedures and precautions detailed in documentation. This symbol is used to warn operators that uninsulated dangerous voltages are present within the equipment enclosure that may pose a risk of electrical shock.
Read all documentation before operating your equipment. Retain all documentation for future reference. Follow all instructions printed on unit chassis for proper operation.
ate normally, or exhibits a marked change in performance.
C. The equipment has been dropped, or the

enclosure damaged.

Do not use the unit if the electrical power cord is frayed or broken. The power supply cord should be routed so that it is not likely to be walked on or pinched by items placed upon or against it. Always operate the unit with the AC ground wire connected to the electrical system ground. Precautions should be taken so that the means of grounding of a piece of equipment is not defeated. Damage caused by connection to improper AC voltage is not covered by any warranty. Do not spill water or other liquids into or on the unit, or operate the unit while standing in liquid. The power cord of equipment should be unplugged from the outlet when left unused for a long period of time.
T obtain service: o contact your nearest Crest Audio Service Center, Distributor, Dealer, or Crest Audio at 201.909.8700 USA or visit www.crestaudio.com for additional information. email techserve @crestaudio.com
IMPORTANT SAFETY INSTRUCTIONS
WARNING: When using electrical products, basic cautions should always be followed, including the following:
1. 2. 3. 4. 5. 6. 7. 8. 9.

10. 11. 12. 13.

15. 16. 17.
Read these instructions. Keep these instructions. Heed all warnings. Follow all instructions. Do not use this apparatus near water. Clean only with a dry cloth. Do not block any of the ventilation openings. Install in accordance with manufacturers instructions. Do not install near any heat sources such as radiators, heat registers, stoves or other apparatus (including amplifiers) that produce heat. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding plug. The wide blade or third prong is provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point they exit from the apparatus. Only use attachments/accessories provided by the manufacturer. Use only with a cart, stand, tripod, bracket, or table specified by the manufacturer or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over. Unplug this apparatus during lightning storms or when unused for long periods of time. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped. Never break off the ground pin. Write for our free booklet Shock Hazard and Grounding. Connect only to a power supply of the type marked on the unit adjacent to the power supply cord. If this product is to be mounted in an equipment rack, rear support should be provided. 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 and Health Administration (OSHA) has specified the following permissible noise level exposures:

Duration Per Day In Hours 1/1/2 1/4 or less
Sound Level dBA, Slow Response 115
According to OSHA, any exposure in excess of the above permissible limits could result in some hearing loss. Ear plugs or protectors to the ear canals or over the ears must be worn when operating this amplification system 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 amplification system be protected by hearing protectors while this unit is in operation.

SAVE THESE INSTRUCTIONS!

table of contents

Introduction

Thank you and congratulations on your purchase of your new Crest Audio X-Rack mixer. Were confident that you will enjoy many years of trouble-free service from it. You will quickly find that it fits into a wide variety of mixing applications with ease. Due to well thought out sets of features, coupled with intelligent circuit design and the highest standards in construction & workmanship, all Crest Audio console products excel above and beyond the competitors products, in every area. This owners manual covers both the XR-20 and the XR-24 XRack mixers. Features are identical for both models, the only difference is the amount of Mono Inputs versus Stereo Inputs. The XR-20 has 12 Mono inputs and 4 Stereo inputs, adding up to a total of 20 microphone inputs. The XR-24 has 8 Mono inputs and 8 Stereo inputs, adding up to a total of 24 microphone Inputs. Please read this manual thoroughly and keep it handy for future reference. If you have any operating concerns that are not covered in this manual, or have application questions of any type, dont hesitate to contact Crest Audio directly either by phone, fax, or email. Here is our technical support contact information: Phone: (201) Fax: (201) Email: techserve@crestaudio.com

Mono Input channels

Front panel controls and rear panel connections

Stereo Input channels

Master section
Aux masters, groups, main outs, monitor section. Front panel controls and rear panel connectors.

Specifications

XR-20/24 block diagram

how to use this manual

format
This manual uses a format that is intended to be easy to read, yet technical for those who need to know all the details. For feature descriptions, this is done by devoting the left side of each page to 1) an overall module picture, 2) a block diagram, and 3) a control closeup. These images all pertain to the features and control descriptions on the right side of the page. The intention is to make the manual easy to read while including all the technical details needed for getting the most out of the X-Rack - a compact, flexible, feature-rich addition to Crest Audio's growing line of audio mixing console products.

conventions

Control Icons
This manual uses symbols to illustrate what the control descriptions are referring to. This makes it possible to avoid redundant wording and makes the control descriptions clear. Switch in the UP non-activated position , Switch in DOWN, activated position Switch that illuminates when in the DOWN position Momentary switch that illuminates when activated LEDthat is on, indicating that it's associated feature is activated Potentiometer Standard 1/4" TRS jack (used for line level inputs and insert sends) 1/4" TRS jack with normal switching (used on insert returns)

Female XLRinput jack

Male XLR output jack

1 Mono input channel

Module
XR-20 / XR-24 owners manual Controls

Block diagram

+48V ON +48V

BAL MIC IN LINE

GAIN 12 - 70 dB

HPF 70Hz -18dB/Oct

HPF BAL LINE IN INPUT PREAMP

27dB PAD

Mono Input channel

Front panel features

Mono Input channel features are identical for both the XR-20 and the XR-24. The XR-20 has 12 Mono inputs and the XR-24 has 8 Mono inputs.
Line Input (mic pad) The input preamp circuit is set up to accept a mic-level signal. This signal is brought in via the XLR mic-input connector located on the rear panel. The 1/4" TRS input jack is disabled. The input preamp circuit is set up to accept a line-level signal from either the XLR mic-input connector or the 1/4" TRS input jack, both located on the rear panel. Since the sensitivity of the input preamp is reduced, this control can also act as a PAD for bringing a very hot microphone feed down to a controllable level, avoiding overload. When a plug is inserted into the 1/4" TRS input jack, the XLR mic-input connector is disabled.
Gain The Input gain control is used to establish proper gain structure in the channel. For best results, use the Solo system to monitor the channel while you set the gain. The goal is maximum gain without distortion. Both the main LED meters (during Solo) and the channels Level/Peak indicator can be used for adjusting gain.

PFL SOLO LEFT SOLO RIGHT TO PEAK CIRCUIT MUTE PAN CHAN FADER FADER AMP +10 MONO L-R G1-2 G3-4

SOLO DC

Bus assignment features
The bus assignment section offers considerable flexibility for creating what eventually becomes the main output mix. Two stereo subgroups are available for creating submixes or separate stereo mixes. All assignments are derived post-fader, post-eq, and post-mute. PAN control The pan control positions the signal within the stereo left/right (or odd/even) field. PAN affects signals that are assigned directly to Left-Right, Groups 1-2 and Groups 3-4 Mono bus assign The channel is assigned to the MONO mix bus. PAN has no affect on MONO L-R bus assign The channel is assigned to the Left and Right mix buses. G 1-2 bus assign The channel is assigned to Groups 1 and 2. Groups 1 and 2 are configured as a stereo pair. They can also be treated as two discrete mono groups by using the PAN control. G 3-4 bus assign The channel is assigned Groups 3 and 4. Groups 4 and 4 are configured as a stereo pair. They can also be treated as two discrete mono groups by using the PAN control. Input fader (100mm) The fader is the primary level control for signals being sent to any of the consoles post fader mix buses, MUTE The input channel is muted and the MUTE LED is alluminated. All AUX feeds and bus assignments are shut off. Insert send and SOLO signals are still active. PK / SIG LED indicator This two-color(green & red) LED is used to monitor the channels signal level. Signal present (green) is monitored pre-fader. Peak (red) is monitored at the preamp and before & after the fader. PFL PFL -Pre fader listen. This button routes the channels signal to the Solo bus for monitoring through headphones or in the control room. The Peak (red) LED is illuminated to show PFL status.

Rear panel

XR-20 / XR-24 owners manual Connectors
BAL MIC IN LINE GAIN 12 - 70 dB HPF 70Hz -18dB/Oct

HPF BAL LINE IN

INPUT PREAMP

INSERT SEND / RTN

POST FADER DIRECT OUT

DIRECT OUT SOURCE

PRE FADER REAR PANEL

X-RACK MONO INPUT MODULE

12 OR 8 MO NO INPUTS AVAILABLE
+48V ON +48V SOLO RIGHT TO PEAK CIRCU IT LEVEL FREQ LEVEL FREQ LEVEL LEVEL MUTE PFL SOLO LEFT
PAN EQ ON HPF BAL LINE IN INPUT PREAMP 100MM SOLO TRIGGER YES PRE SOURCE MUTE ? NO PRE FADER PRE-SOURCE BUFFER A3-4 PRE A1-2 PRE
LF 80 HZ LOWMID 80 - 2 KH Z HI MID 400 - 8 KH Z HF 12 KH Z

CHAN FAD ER

FADER AMP

BUS ASSIG N SW ITCH ES

INPUT SIGNAL LED PEAK R (PFL) DIRECT OUT SOURCE POST FAD ER

PAN 1-2

LEVEL 1-2 A1 A2
PRE EQ POST FADER PRE FADER PRE INSERT

DIRECT OUT

LEV 4 A4 A5-6 PRE LEV 5

LEV 6 A6

Rear panel features
48 V Phantom power 48 volts DC is applied to pins 2 and 3 on the mic-input XLR connector.This option is used with condenser microphones and active direct boxes that require an external DC voltage (phantom power ) in order to operate. Line INPUT jack Line-level signals, balanced or unbalanced, may be brought into the input channel through this jack. The LINE INPUT switch must be pressed for this jack to be active. MIC INPUT jack This balanced female XLR accepts a low-impedance microphone signal, or a line-level signal, depending on the position of the LINE INPUT switch on the front panel. INSERT jack This switching 1/4 TRS jack allows an external signal processor to be inserted into the signal path of the channel. The tip carries the SEND signal and the ring carries the RETURN signal. DIRECT OUT jack The channels signal can be brought out of the console via the direct out jack. The signal that appears at this jack is normally post fader.There is an internal option for making it pre fader.

1 Stereo input channel

BAL MIC IN

GAIN 15 - 60 dB

BAL LINE IN

PRE EQ

INPUT SIGNAL LED

PEAK R (PFL)

Stereo Input channel
Stereo Input channels features are identical for both the XR-20 and the XR-24. The XR20 has 4 Stereo inputs, and the XR-24 has and 8 Stereo inputs. On both models the Stereo inputs are located to the left of the master section, to the right of the Mono inputs. They can be treated as mono input channels, or as Stereo input channels.
Stereo Line Input (mic pad) The stereo input preamp circuit is set up to accept mic-level signals. The signals are brought in via the XLR mic-input connectors located on the rear panel. The 1/4" TRS input jacks are disabled. The stereo input preamp circuits are set up to accept line-level signals from either the XLR mic-input connectors or the 1/4" TRS input jacks, all located on the rear panel. Since the sensitivity of the stereo input preamp is reduced, this control can also act as a PAD for bringing very hot microphone feeds down to a safe level, avoiding overload. When a plug is inserted into a 1/4" TRS input jack, the XLR connector is disabled.
Gain The Input gain control is used to establish proper gain structure in the channel. The GAIN control affects both the Left and Right input signals. For best results, use the Solo system to monitor the channel while you set the gain. The goal is maximum gain without distortion. Both the main LED meters (during Solo) and the channels Level/Peak indicator can be used for adjusting gain.
SUM INPUTS By summing the inputs, a stereo input channel can be used as a mono input channel. The channel functions as a stereo input. If signals are applied to both the Left and Right input jacks, they will be summed together as a mono signal. If a signal is applied to just one of the input jacks, it will be treated as a mono signal throughout the rest of the channel.
PRE FADER LEVEL FREQ LEVEL FREQ LEVEL LEVEL

CHAN FADER

FOUR BAND EQ - LEFT PRE EQ

FOUR BAND EQ - RIGHT

Front panel features Stereo EQ
The Stereo Input channel has two parallel EQ circuits that are controlled by the same set of knobs. high frequencyHF Boost / Cut 15dB boost and cut. Shelving @ 12 kHz high midHM Frequency Continuously sweepable between 400 Hz and 8 kHz. Boost / Cut 15dB boost and cut. Bell curve with a Q of 1 Low midLM Frequency Continuously sweepable between 100 Hz and 2 kHz. Boost / Cut 15dB boost and cut. Bell curve with a Q of 1 Low frequencyLF Boost / Cut 15dB boost and cut. Shelving @ 80 Hz. EQ on Equalizer is on. This switch is used to activate the EQ section and can be used to make A/B comparisons between "flat" and eq'd signals.

BAL MIC IN LINE GAIN 15 - 60 dB MONO BAL LEVEL FREQ LEVEL

LF 80 HZ

LOW MID 80 - 2 KHZ

FOUR BAND

LF 80 HZ LOW MID 80 - 2 KHZ
SOLO TRIGGER PRE-AMP OUT L&R
SIG REAR PANEL G POST FADER X-RACK STEREO INPUT MODULE
4 OR 8 STEREO INPUTS AVAILABLE
+48V ON +48V PRE FADER BAL MIC IN GAIN 15 - 60 dB LEVEL FREQ LEVEL FREQ LEVEL LEVEL TO PEAK CIRCUIT PFL SOLO LEFT SOLO RIGHT

HI MID 400 - 8 KHZ

MONO CHAN FADER FADER AMPS LEFT +10 POST FADER +10

FOUR BAND EQ - LEFT

RIGHT A1-2 PRE LEFT RIGHT PAN 1-2 LEVEL 1-2
YES INPUT SIGNAL LED SOLO TRIGGER PRE-AMP OUT L&R LEFT SIG PRE SOURCE MUTE ? PRE FADER PRE EQ POST FADER L&R PRE FADER L&R PRE FADER RIGHT PRE EQ PRE-SOURCE SELECT A3-4 PRE L&R MIXED LEFT PRE-SOURCE BUFFERS LEV 3 A3

NO A5-6 PRE

REAR PANEL
48 V Phantom power 48 volts DC is applied to pins 2 and 3 on the mic-input XLR connectors. This option is used with condenser microphones and active direct boxes that require an external DC voltage (phantom power ) in order to operate. Line INPUT jacks - Left and Right Line-level signals, balanced or unbalanced, may be brought into the input channel through this jack. The LINE INPUT switch must be pressed for these jack to be active. MIC INPUT jack - Left and Right These balanced female XLRs accept low-impedance microphone signals, or line-level signals, depending on the position of the LINE INPUT switch on the front panel.

3 Master section

LEFT OUT RIGHT OUT

LED METERS

FOLLOW SOLO, NORMALLY SHOW L / R OUT

+-21 24

LEFT PRE-FADER ADD MONO RIGHT PRE-FADER

ALT LEVEL L R

ALT OUT
SOLO FEED L-R SOLO CTRL SOLO ON PWR ON
AUDIO SOURCES FOR MONITOR - ALL PRE-FADER
GRP3-4 GRP1-2 L-R MONO AUX1-2 TAPE IN SOLO OFF

MONITOR LEVEL

SUM MONO

TO PHO NES MO N-L MO N-R

MONITOR SOURCE SELECT ( SELECTED SOURCES ADD TOGETHER )

MONITOR OUT

SOLO FEED L-R SOLO CTRL

TAPE-IN LEVEL

TAPE TO AUX 1-2

AUX-1 BUS

SOLO LEFT
SOLO MIX AMPS SOLO FEED L-R TO: PHONES, MONITOR & METERS
TAPE-IN L TAPE IN L TAPE TO L/R TO: PHONES & MONITOR ADD MONO (RECESSED) LEFT OUT

LEFT BUS R IGH T BUS

SOLO RIGHT

AUX-2 BUS

SO LO CO NTRO L LOG IC

SOLO CTRL

TAPE-IN R

TAPE IN R

TAPE IN

FROM MONITOR

SOLO OFF

HEADPHONE LEVEL

TAPE-IN L RIGHT OUT TAPE-IN R MONO OUT MONO PRE

TO ALT-OU T

MON-L MON-R

HEADPHONE AMPS

The XR-20 & XR-24 have a comprehensive output section, including meters, master level controls, and a flexable group assignment section. Headphone control section In normal use, the headphone out is used to monitor the Solo system. The Solo system is made up of anything that is PFLd (pre-fader-listen) or AFLs (after fader listen). The hirarchy of what appears in the headphones when nothing is soloed, or when the SOLO OFF button is pressed is as follows: MONITOR when FROM MONITOR is engaged. TAPE IN whenTAPE IN is engaged and FROM MONITOR is not engaged. LEFT and RIGHT masters when neither FROM MONITOR nor TAPE IN are engaged.
ADD MONO (RECESSED) LEFT OUT TAPE-IN L RIGHT OUT TAPE-IN R MONO OUT MONO PRE

TO ALT-OUT

Headphone jack This 1/4 TRS jack is intended for stereo headphones. It can also be used as a stereo control-monitor output from the mixer. From this jack you can get a number of signals, including SOLO, Left, Right & Mono, and Monitor / Tape feeds. Headphone level This knob controls the level that appears at the Headphone Jack. SOLO OFF Solo (PFL or AFL) overrides the default headphone signals unless this button is depressed. Whenever something is Soloed, it appears in the headphones. Soloed signals do not appear in the headphones.
FROM MONITOR The post-level control MONITOR output becomes the signal in the headphones when nothing is soloed. This overrides TAPE IN if the TAPE IN button is depressed. TAPE IN The TAPE IN signals appear in the headphones when the FROM MONITOR button is not depressed and nothing is Soloed. ADD MONO to Phones and ALT OUT Mono, or Center can be added when the LEFT and RIGHT masters are present at the Phone out, on the front panel and the ALT OUT jacks on the rear panel. The switch is recessed to prevent its state from acidentaly being switched. The default signal at the Headphone output and the ALT OUT jacks is the stereo LEFT/RIGHT mix. In addition to the LEFT/RIGHT mix at he the Headphone output and the ALT OUT jacks, the MONO master signal is blended in. 12 V Lamp jack A BNC jack is used for hooking up a goose-neck lamp. The center connection is 12 Volts DC and the outer connection is ground. A medium or high-intensity 12V DC Littlite is can be used.
LED meters - Left and Right A pair of LED arrays are provided for monitoring the output levels. They follow the SOLO system, making it easy to adjust input and output levels by PFLing and AFLing different sources. They normally show the LEFT and RIGHT output levels. When something is Soloed, it replaces LEFT and RIGHT on the meters. SOLO LED This red LED lights up when anything on the mixer is soloed. PWR LED This green LED illuminates to indicate that the mixer is powered up and ready for use.

Module Block diagram

TAPE-IN LEVEL TAPE-IN L TAPE IN L TAPE TO L/R TO: PHONES & MONITOR ADD MONO (RECESSED) LEFT OUT TAPE-IN L TAPE TO AUX 1-2

AU LEFT BUS AU RIGHT BUS

X-RACK AUX BUSES 1-2 (STEREO PAIR)
AUX MIX AMPS AUX 1 INSERT SEND / RTN AUX 2 AUX 1-2 MASTER

SOLO LEFT +10 AUX 1 OUT

SOLO RIGHT SOLO DC +10

AUX 2 OUT

AUX MIX AMP
X-RACK AUX BUSES 3 THRU 6 (1 OF 4 SHOWN)

AUX MASTER +10

SOLO LEFT SOLO RIGHT SOLO DC

AUX OUT

TAPE IN level On the rear panel there are Left and Right TAPE IN connectors, both 1/4 TRS and RCA. They can be used to bring in a stereo source such as a two-track playback from tape, CD, MD, or a sampler. This knob controls the level to the Aux 1/2 and Left/Right buses. TAPE IN assignment TO A1-2 This assigns the stereo TAPE IN to Auxes 1 and 2, which are configured as a stereo pair. This is useful for stereo program monitoring. TO L-R This assigns the stereo TAPE IN feed to the Left and Right mix buses. This is useful for in-between-set background music and as an extra stereo return. AUX OUT 1-2 level control This is the master stereo output level control for the AUX 1/2 pair. Aux 1-2 AFL This button assigns the AUX 1/2 stereo pair to the solo system. Since it is AFL, the signal is monitored after the AUX insert and master level control. Auxes 1 & 2 show up in stereo in the System - 1 on the left and 2 on the right. AUX OUT 3, 4, 5 & 6 level controls These are the master output level controls for Auxes 3, 4, 5 &6. Aux 3, 4, 5, & 6 AFL These buttons assign Auxes 3, 4, 5 & 6 to the solo system. Since they are AFL, the signals are monitored after the AUX inserts and master level controls.

GROUP MIX AMP

X-RACK GROUPS (1 OF 4 SHOWN)

PRE FADER

RIGHT POST FADER GROUP LED PEAK R (AFL)

GROUP FADER

TO GROUP MIX-AMP

GROUP BUS IN

GROUP-TO-MAIN ASSIGN SWITCHES
ODD GROUPS FEED LEFT SOLO, EVENS FEED RIGHT SOLO SOLO LEFT

+10 GROUP OUT

SIG SOLO RIGHT SOLO DC G
GROUP assignment section The XR-20 offers a flexible group assignment arrangement. Each of the four Groups can be assigned to Left, Right and Mono busses, in any combination. M - Mono assignments for Groups 1, 2, 3 & 4 Each of the four groups has a Mono assignment button for routing its post-fader signal to the Mono mix bus. L - Left assignments for Groups 1, 2, 3 & 4 Each of the four groups has a Left assignment button for routing its post-fader signal to the Left mix bus. R - Right assignments for Groups 1, 2, 3 & 4 Each of the four groups has a Right assignment button for routing its post-fader signal to the Right mix bus. Group Master Faders 1, 2, 3 & 4 Each Group has a master fader for adjusting its overall level. These signals show up at the Group OUT jacks on the rear panel and can be assigned to the Left, Right and Mono buses. They also feed the Solo system when the Group AFL buttons are down. GroupPK / SIG LED indicators These two-color(green & red) LEDs are used to monitor each of the groups signal levels. Signal present (green) is monitored pre-fader. Peak (red ) is monitored at the preamp and both before & after the fader. AFL buttons for Groups 1, 2, 3 & 4 Each of the four groups has an AFL button for monitoring through the SOLO system. The signal assigned to the Solo bus is picked up after the fader. The groups show up in stereo in the Solo system - odd - left, even right. The Peak (red) LEDs are illuminated to show AFL status.
GRP3-4 GRP1-2 L-R MONO AUX1-2 TAPE IN SOLO OFF MONITOR LEVEL SUM MONO

TO PHONES MON-L MON-R

MONITOR Output section The XR-20 and XR-24 offer an extensive monitoring system which can be used for several alternate mix and remote listening purposes. The main L/R & M mixes, the Groups, Auxes 1&2, the Tape IN, and the Solo system can all be routed to the Monitor outs. Like the Headphone section, the SOLO system is automatically routed to the Monitors. This can be defeated by pressing the SOLO OFF button. MONITOR Level control This knob controls the signal level that appears at the Monitor output on the rear panel. This signal can also be assigned to the headphone system by pressing the FROM MONITOR button located below the Headphone level control. SUM MONO The MONITOR System operates in stereo, and has Left and Right outputs.You can assign several stereo sources to the Monitor bus,including the Aux 1/2 stereo pair, the Left/Right busses, the TAPE IN, and the Groups,in stereo odd/even pairs. The MONITOR system operates in stereo. Any stereo signals that are assigned to the Monitor system remain stereo. The MONITOR system operates in mono. Any stereo signals that are assigned to the Monitor system are summed together. SOLO OFF Like the Headphone section, the Solo system is automatically routed to the monitors.Solo takes overrides anything that is assigned to the monitors. The Solo system does not appear in the monitors. Note If you are 1) routing the Monitor outs to the Headphone system by pressing the FROM MONITOR button in the Headphone section, and, 2) you dont want the Solo system to show up in the headphones, you must press both SOLO OFF buttons -the one in the Headphone section and the one in the Monitor section.

MONITOR Output section SOURCE SELECT The Source select portion of the Monitor system allows you do assign the primary mix buses to the Monitor outputs. All assignments are post insert, pre-fader. All selected sources are added (summed) together. TAPE IN Assigns the TAPE IN L & R signals to the monitors. The TAPE IN jacks are located on the rear panel. 1/4 TRS jacks and RCA phone plugs are provided for easy hookup. A1-2 (Aux 1 & 2) Assigns Auxes 1 and 2 to the Monitor outputs. Auxes 1 and 2 are configured as one stereo Aux bus (see Mono input channel description). 1 is Left and 2 is Right. MONO Assigns the Mono bus to both the Left and Right Monitor outs. L-R (Left & Right) Assigns the Left and Right buses to the Left and Right Monitor outs. G1-2 (Groups 1 & 2) Assigns Groups 1 and 2 to the Monitor outs.1 is Left and 2 is Right G3-4 (Groups 2 & 4) Assigns Groups 3 and 4 to the Monitor outs. 3 is Left and 4 is Right.

LEFT MIX AMP

X-RACK MAIN OUT LEFT-RIGHT

L-PRE FADER

L-INSERT SEND / RTN

L/ R SIGNAL LED PEAK R

LEFT FADER L-POST FADER +10

MIC LEVEL LEFT BAL OUT

30dB PAD

SIG RIGHT MIX AMP

100MM G R-INSERT SEND / RTN

RIGHT BUS IN LEFT BUS IN

R-PRE FADER
RIGHT FADER R-POST FADER +10

MIC LEVEL RIGHT BAL OUT

MONO MIX AMP

X-RACK MAIN OUT MONO

M-PRE FADER

M-INSERT SEND / RTN

MONO SIGNAL LED MONO BUS IN PEAK R (AFL)
MONO FADER M-POST FADER +10

MIC LEVEL MONO BAL OUT

SIG SOLO LEFT SOLO RIGHT SOLO DC
Mono PK/SIG LED Green/Red - Flashes to indicate the Mono master level. Green during normal operation and red to indicate overload either at the mix amp or at the fader. Left/Right PK/SIG LED Green/Red - Flashes to indicate the summed Left/Right master levels. Green during normal operation and red to indicate overload either at the mix amps or at the faders. MONO AFL Assigns the post-fader Mono master signal to Solo bus, and illuminates the Peak (red) LED. MONO, LEFT & RIGHT Master faders (100mm) These are the master level controls for the main Left, Right and Mono outputs. ALT OUT (L-R) Sets the level for the Alternate Left & Right outputs. These outputs are made up of the pre-fader Left/Right mix. If the ADD MONO TO PHONES & ALT OUT button is depressed, the pre-fader MONO mix becomes part of the ALT OUT as well. Jacks are located on the rear panel. 1/4 TRS and RCA jacks are provided for easy hookup.

L/R SIGNAL LED PEAK R

Left, Right and Mono bus inputs These three female XLRs are used to bring external signals directly into the Left, Right and Mono mix buses. This is useful for linking multiple mixers together. Group 1, 2, 3 & 4 bus inputs These 1/4 TRS jacks are used to bring external signals directly into the first four sub groups. This is useful for linking multiple mixers together.
AUX Inserts 1 through 6 The Aux masters have pre-fader inserts for patching in signal processors. This is useful when using Aux outputs for stage monitors. Tip is Send and Ring is Return. Aux OUT TRS Jacks 1 through 6 The six post-fader Aux master outputs are available at these 1/4 TRS jacks. Aux OUT XLRs 1 through 6 The six post-fader Aux master outputs are also available at these male XLR jacks. (pin 2 hot) Group Inserts 1 through 4 The Groups have pre-fader inserts for patching in signal processors. This is useful when using Group outputs for recording or stage monitors. Tip is Send and Ring is Return. Tape (line) in The Left and Right Tape inputs are available as both 1/4 TRS and RCA. Alt Out The Left and Right Alternate outputs are available as both 1/4 TRS and RCA. Monitor out The Left and Right Monitor outputs are available as both 1/4 TRS and RCA. Left, Right and Mono Main Inserts The Left, Right and Mono buses have pre-fader inserts for patching in signal processors. Tip is Send and Ring is Return. Left, Right and Mono main Outputs The Left, Right and Mono post-fader signals appear at these male XLRs. Mic/Line Switches for Left, Right and Mono main outputs These switch are recessed to prevent the from accidentally being hit Output levels are presented at line level for feeding the line inputs on a signal processor, another mixer, or a power amplifier. Output levels are reduced to mic level for feeding the Microphone inputs on a signal processor or another mixer. Outputs are protected against phantom power.
Use 5-Pin DIN cable to interconnect two Consoles

SOLO-LINK:

TIES SOLO AUDIO AND CONTROL BETWEEN CONSOLES. SLAVE SOLOS SHOW UP ON MASTER CONSOLE.
POLY FUSES SHORT-CIRCUIT PROTECTION

SOLO LINK IN OUT

P O W E R
SOLO-LINK CONNECTORS. USE 5-PIN DIN CABLE FROM SLAVE CONSOLE OUT TO MASTER CONSOLE IN
BNC CONNECTOR FOR 12VOLT LAMP ( ON FRONT PANEL )
AC IN 100-240V 50 / 60 Hz 80W
UNIVERSAL INPUT-VOLTAGE SWITCHING POWER SUPPLY
INTERNALLY FUSED AND SHORT-CIRCUIT PROTECTED

-17V +48V

ANALOG GROUND
TO POWER DISTRIBUTION RIBBONS

AUX DC GROUND

X-RACK REAR PANEL: AC INLET & SWITCH
SAFETY GROUND CHASSIS GROUND
Solo Link When using multiple X-Rack mixers together, the solo systems can be linked. A 5-pin DIN cable is used to link the Solo Audio and control signals.
AC Input The XR-20 and XR-24 use an internal switching power supply which is capable of accepting a wide range of line voltages. This industry-standard IEC connector will mate up with any of the common IEC line cords. The in-coming voltage can be anywhere between 100 and 240 volts, +/- 10%. The AC frequency can be 50 Hz or 60 Hz.
Frequency response THD Noise Crosstalk Phase Shift Mic-in
+0/-1dB 20Hz-20kHz ref 1kHz (any input to any output) any output <0.01% THD 20Hz-20kHz@ +15dBu out mic ein: better than 128dBu 20Hz to 20kHz 150 ohm source, 60dB gain Bus Noise: better than -85dBu channel mute >90dB, channel routing >80dB channel fader attenuation >90dB aux send attenuation >85dB < +/- 30 degrees, 20Hz to 20kHz mic-in to main out XLR 4k ohm balanced max voltage gain to main outs = 100dB >10k Ohms balanced >10k Ohms unbalanced >10k Ohms balanced XLR 100 ohms balanced (switchable between line or mic level) TRS 50 ohms ground compensated XLR & TRS 50 ohms gnd compensated Stereo, Intended to drive > eight-ohms 17.5" in height (10u) x 19" in width x 4.5" in depth behind panel 100 -240 VAC, 50/60 Hz Five Years
Line-in XLR and TRS RCA tape input Bus inputs L/R/M outputs Group/direct out Aux outputs Headphones Dimensions Internal Power Supply Warranty
XR-20 / XR-24 owners manual Version 1.0 March 28, 20001

Crest P/N D7000025

Crest Audio 100 Eisenhower Drive Paramus NJ 07652 (201) 909-8700 www.crestaudio.com