Crest Audio XRM - 12 owner manual Line Input Mic Pad, Gain, Hz Lo-Cut filter, Lo Cut Switch

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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 located on the rear panel.The XLR signal is normal'd to the 1/4” TRS jack. If nothing is plugged into the TRS jack, the XLR signal is fed to the preamp when the LINE switch is pressed. Since the TRS signal is always padded down by 26dB, this feature allows the LINE switch to act as a PAD switch for bringing a very hot microphone signals down to a controllable level, avoiding overload.When a plug is inserted into the 1/4" TRS input jack, the XLR mic-input signal is disconnected and the signal present on the 1/4” plug is fed to the preamp. If plugs are inserted into both the XLR and TRS jacks, this switch acts as an input selector switch between the two jacks.

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 channel’s Level/Peak indicator can be used for adjusting gain.

70 Hz Lo-Cut filter

This filter reduces or eliminates unwanted low frequencies without substantially affecting the pro- gram material. Quite often, such unwanted low frequencies are included with mic- or line-input signals. For example, stage rumble or wind can be picked up through vocal mics.The cut-off fre- quency of the filter is 70 Hz and the slope is -18dB per octave.This type of filter is also referred to as a Hi-pass filter (HPF). It allows the hi-frequencies to pass, but stops the lo-frequencies.

Lo Cut Switch

Lo-Cut filter is bypassed.

Lo-Cut filter is on.

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Contents Rackrack mount mixers XRM 12 Output Monitor Mixer Important precautions Table of contents XRM block diagram Control Icons How to use this manualModule Controls Block diagramHz Lo-Cut filter Lo Cut SwitchLine Input Mic Pad GainXRM Mono Input Module Low frequency-LF High frequency-HFHigh mid-HM Low mid-LMMaster Faders Chan Fader Block diagramModule Mix Sends 1 Mix 1 4 PREMute Channel Level and Control Mute Switch UP, LED OFFMute Switch DOWN, LED on PeaK / SIGnal LEDRear panel ConnectorsXLRMic Input jack Pin-1 Lift Switch+48V On Line Input jackMono input channel Mono Input channel Module Controls Stereo input channelSUM Inputs Stereo-specific Str Line In Mic PadSUM Front panel features Stereo EQ UT Module Master Faders Chan Level Chan SendsMix Send features XRM Stereo Input Module Front panel features Balanced Line Inputs Rear panel ConnectorsSplit-Out XLR jack Master section Solo Meters L & R Solo SystemHeadphone jack Phones Headphone/Monitor Level ControlBlock diagram- Mix Outputs Module Block diagram- Common Input12V Lamp jack STR Pair switchCommon Input Common Input LevelOutput Masters Master Fader Mix Output Level Peak/Signal LED + AFL Switch & indicatorMix Inserts and Outputs Bus InputsPage Solo and Monitor Circuits Rear panelMonitor Output Other Inputs and Outputs Common InputSolo Link Connectors Tie Mixers together AC Input Connector Pinout detailSolo Link Audio LinkingXLR Female Specifications Crest P/N D7000028
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