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owner’s manual
X-Rack rack mount mixers
XRM - 12 Output Monitor Mixer
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XRM owner’s manual Important precautions Service Information This symbol is used to alert Save the carton and packing materials! 1 the operator to follow important Should you ever need to ship the unit, Do not open unit! procedures and precautions use only the original factory packing. detailed in documentation. Opening the unit will expose you to potentially dangerous voltages.There are For replacement packaging,call Crest Audio’s no user serviceable parts inside. This symbol is used to wa
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table of contents Mono Input channels p. 7 Introduction Front panel controls and rear panel connections 1 Thank you and congratulations on your purchase of your new Crest Audio X-Rack mixer.We’re confident that you will enjoy many years of trouble-free service from it.You will quickly find Stereo Input channels p.19 that it fits into a wide variety of mixing applications with ease. 2 Front panel controls and rear panel connections Due to well thought out sets of features, coupled with intelli- g
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XRM owner’s manual XRM block diagram p.4 +48V ON PFL SOLO LEFT XRM MONO INPUT MODULE XRM MIX PAIR ODD MIX MAIN BUS IN 12 MONO INPUTS AVAILABLE RIBBON 1 OF 6 PAIRS SHOWN SOLO RIGHT CABLE TO BAL XLR - PEAK IN 40 WAY CIRCUIT SOLO DC HPF 40Hz MIX INSERT MIX SENDS 1 & 2 -18dB/Oct HPF ODD GAIN SEND / RTN LINE 70Hz LEVEL FREQ LEVEL FREQ LEVEL LEVEL MUTE M1 MIX AMP (MIC PAD) 10 - 70 dB LEV / LEV -18dB/Oct __ HPF MIX 1-4 LEV / PAN M2 PRE SWITCHING PRE SPLIT EQ ON AFFECTS BOTH CHAN FADER OUT ODD & EVEN
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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 con- trol 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 need
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XRM owner’s manual Mono input channel 1 Module Controls LINE INPUT ( MIC PAD ) 40 GAIN 20 50 40 GAIN 10 70 20 LO CUT 50 0 – + HF 88 15 15 10 70 2K 3K 1K 5K 600 6 LO CUT 400 8K 0 HM – + 0 88 F HF 15 15 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 300 1K 100 2K 0 LM – + 88 15 15 0 – + LF 88 15 15 Block diagram EQ 1 ON MIX SENDS PRE +48V ON 10 – 1 0 + 20 3 S 30 T R 40 6 • 10 – 2 0 + 20 BAL XLR 3 30 IN 40 6 • 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 10 – 3
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Mono Input channel 1 Front panel features Line Input (Mic Pad) With this switch in the UP position, 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 ignored. When the switch is depressed, a Pad is inserted into the signal path and 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 loca
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XRM owner’s manual Mono input channel 1 Module Controls 10 70 40 GAIN LO CUT 20 50 0 10 70 – + HF LO CUT 0 – + HF 88 8 88 15 15 2K 15 15 3K 1K 1 5K 2K 600 60 400 8K 3K 1K 1 0 HM – + 88 5K 600 60 15 15 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 400 8K 300 30 1K 0 HM – + 100 2K 0 LM – + 88 88 8 15 15 0 – + LF 15 15 88 15 15 EQ 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 1 ON MIX SENDS 300 30 1K PRE 10 – 1 0 20 + 2 3 S 30 T 3 40 R 4 100 2K 6 • 10 – 2 0 0 LM
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Mono Input channel 1 Front panel features Equalizer (EQ) Many audio signals coming into the console require some degree of corrective eq in order to be part of a good sounding mix. XRM offers a 4-Band EQ on each channel.The input EQ consists of the bands: High, High-Mid, Low-Mid and Low.The High and Low frequency bands are shelving equalizers, each have a boost/cut control and their frequencies are fixed.The High-Mid and Low- Mid bands have a bell-shaped response, each band features variable boo
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500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 XRM owner’s manual Mono input channel 1 Module Chan Fader Chan Sends Master Faders COMMON INPUT SOLO PWR ON + 20 STR PAIR LO CUT STR PAIR LO CUT 3 M S MIX SENDS 30 T R 40 40 1–23–4 PRE GAIN 20 6 • 50 10 – 12 0 10 – 10 70 1 + 20 0 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 + LO CUT 10 20 2 3 3 0 30 – + HF S 30 3 5 T 88 40 R 6 40 4 • 15 15 0 6 • M 2K
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Mono Input channel 1 Front panel features Mix Send features The XRM is capable of generating 12 mono mixes, 6 stereo mixes, or a combination of both mono and stereo mixes. Each of the six Odd/Even pairs of sends can be configured as a stereo pair- the Odd pot becomes the level control, the Even pot becomes the pan pot.The changeover to stereo operation is controlled by the STR PAIR switches located above the master faders.A LO CUT switch is also present for activating the hi-pass filter (40Hz, -
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500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 XRM owner’s manual Mono input channel 1 Module Controls 6 • MUTE 40 GAIN 20 50 1 10 70 LO CUT 0 – + HF 88 CHAN 15 15 LEVEL 2K 3K 10 – 1K 0 5K 600 + 20 2 400 8K 0 5 HM – + 30 3 88 40 15 15 10 • 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 300 1K PK SIG 100 2K 0 LM – + 88 PFL 15 15 0 – + LF 88 Block diagram 15 15 EQ 1 ON MIX SENDS PRE 10 – PFL 1 0 SOLO LEFT + 20 LE 3 MAIN S 30 T R 40 RIBBON 6 SOLO RIGHT • 10 – 2 0
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Mono Input channel 1 Front panel features Channel Level and Control This next set of controls allows the operator to control and monitor the overall level of the channel signal. Mute Sw and LED The Mute switch kills the channel signal and prevents it from feeding any Mix Send pots.The mute- element itself is a FET transistor, allowing for timed, ramped on-off control of the channel signal.This avoids any “pops and clicks” when muting a channel. Normally, the Mute will also affect the PRE signals
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XRM owner’s manual Mono input channel 1 Connectors Rear panel +48V +48V +48V +48V +48V +48V +48V +48V +48V +48V +48V +48V +48V +48V +48V +48V On On On On On On On On On On On On On On On On Balanced Line Inputs For Stereo Channels S1–S4 S4 S3 S2 S1 PUSH PUSH PUSH PUSH Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In +48V On L L 12 11 10 9 8 7
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Mono Input channel 1 Rear panel features +48 V On +48 volts DC is applied equally (thru current-limiting resistors) to both pins 2 and 3 on the mic- input XLR connector.This feature is used with condenser microphones and active direct boxes that require an external DC voltage (phantom power) in order to operate. For dynamic or ribbon mics, phantom voltage is not required and should be switched OFF. NOTE 1: Operating this switch (On or Off) causes large voltage swings to occur at the input of th
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XRM owner’s manual Mono input channel 1 Connectors Rear panel +48V +48V +48V +48V +48V +48V +48V +48V +48V +48V +48V +48V +48V +48V +48V +48V On On On On On On On On On On On On On On On On Balanced Line Inputs – For Stereo Channels S1 S4 S4 S3 S2 S1 +48V PUSH PUSH PUSH PUSH Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In On L L 12 11 10 9 8
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Mono Input channel 1 Rear panel features (continued): Split-Out XLR jack This male XLR jack is wired pin-to-pin to the female XLR input jack. In combination with the female XLR, it forms a passive,Y-Split of the input signal.This split-signal can be used to feed the mic input to another mixer (usually the FOH mixer), or to “mult” the input to another chan- nel on the XRM. NOTE: This pin-to-pin connection between XLR jacks is NOT affected by the Pin-1 lift switch. Chan Insert jack T= Send R= Retu
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XRM owner’s manual Stereo input channel 2 Module Controls STR LINE IN ( MIC PAD ) 35 GAIN 20 STR LINE IN 40 ( MIC PAD ) 15 60 SUM INPUTS 35 N GAIN 0 – + F HF 20 2 88 40 15 15 2K 3K 1K 5K 600 60 15 60 400 8K 0 M HM – + SUM 88 T INPUTS 15 15 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 0 300 3 1K + F HF 100 2K 0 M LM – + 88 Block diagram 15 15 0 – + F LF 88 15 15 +48V ON XRM STEREO INPUT MOD EQ S1 ON 4 STEREO INPUTS AVAILABL MIX SENDS PRE 10 – 1 0 + 20 2 LINE GAIN 3 BAL XLR S
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Stereo Input channel 2 Front panel features The XRM features four, full-function Stereo Input channels.These inputs are labeled S1 thru S4 and are located directly left of the master section. Each stereo channel features two mic preamps, so mic-level stereo sources can be processed on one common channel. In cases where just a mono source is present, the SUM INPUTS switch allows a mono source (plugged into either left or right input) to feed both sides of the stereo chan- nel, effectively turning
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XRM owner’s manual Stereo input channel 2 Module Controls 15 60 STR LINE IN ( MIC PAD ) 35 SUM GAIN T 20 2 INPUTS 40 15 60 0 SUM – + HF HF INPUTS 0 – + HF 88 88 8 15 15 2K 3K 15 15 1K 1 5K 600 60 2K 400 8K 3K 0 HM 1K – + 88 8 K 5K 15 15 600 60 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 300 30 1K 400 8K M 0 HM 100 2K – + 0 LM – + 88 8 88 15 15 0 – + LF 88 8 15 15 15 15 EQ S1 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 ON MIX SENDS 300 3 1K PRE 10 – 1 0 20
