Crest Audio XRM - 12 - Manual (Page 25)

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. Both sides of the Stereo channel (left & right) are simultaneously controlled.
Mute Sw and LED
The Mute switch kills the channel signals 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
of the channel (see Mix Send details). PRE can be selected for Mix Sends 1 thru 4, and is normally the
Pre-fader channel signal.There are internal jumpers that allow the user to change the definition of this
PRE signal on a channel by channel basis, or it can be specified at the time of order and reconfigured
during the product build at the factory.The PRE signal can be changed from its normal Pre-Fader set-
ting and redefined as either Pre-Insert or Pre-EQ.Additionally, the mute operation of the PRE signal
can be changed from its default of “Follow Chan Mute” to “Ignore Chan Mute”.Again, this chan by
chan option can be done either by the user or by the factory at the time of order.
Mute Switch UP, LED OFF
Channel is un-muted. Signal is allowed to pass (pre or post fader)to the Mix Send pots.
Mute Switch DOWN, LED ON
Channel is muted.The Post-Fader signals are prevented from reaching the Mix Send pots.The
PRE signals (available for Mix Sends 1-4) are also muted unless the option has been changed to
“Ignore Chan Mute”.
Channel Level Pot
This rotary pot controls the level of the Post-Fader signals sent to the individual Mix Sends. Mix Sends
5 thru 12 always receive this Post-Fader signal. Mix Sends 1 thru 4 have the option of selecting a Pre-
fader signal by the use of the PRE button.
Continuously variable from OFF (full CCW) to +10dB gain (full CW).The panel is marked with
the dB level of the channel, 0dB (unity channel gain) is at approx the 2-o’clock position.
PeaK / SIGnal LED
This bi-color LED performs three functions:
1) Chan level; 2) Channel overload; 3) PFL status.
1) Varying intensity Green shows the L&R summed, pre-fader signal level
2) Red warns of channel clipping anywhere within the signal path. 6 points are monitored by the Peak
circuitry: Input preamps, EQ circuits, and Fader amps. If any of these points come within 3dB of clip-
ping, the LED will illuminate Red.
3) If the Chan PFL button is depressed, the LED will illuminate Red.
PFL Sw (and LED)
The XRM is equipped with a Stereo Solo system. Input Channels are monitored Pre-Fader (PFL), and
outputs are monitored After-Fader (AFL).When a Stereo channel is Solo’d, it appears in the Solo
meters and headphone/monitor system as a stereo signal. If the SUM INPUTS sw is depressed, a
mono sum will be fed to the Solo system.The Solo’d signal is Pre-fader, the level feeding the Solo sys-
tem is not affected by the setting of the Chan Lev pot.
Channel Pre-fader signal is sent to the Solo bus and displayed on the Solo meters and can be
heard on the Headphone and Monitor outputs.The chan PK/SIG LED will illuminate RED, indicating
that the PFL button is depressed.The Solo system is additive, so any and all channels that have their
PFL switches depressed will be mixed together and monitored by the Solo system.
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Stereo Input channel
2