Operation And Usage; Start Up; Monitoring; Channel Gain And Equalization - audiophony GOA7C Manuel Utilisateur

4. OPERATION AND USAGE

4.1. Start up

Power up the mixer by pushing the POWER (13) switch. The green pilot-light, integrated into the
switch itself, will immediately light up. Although the noise generated by powering up the GOA7C is
reduced to a bare minimum and is nearly null with the MASTER (21, 28) faders down, it is always
advisable not to forget about this power-up sequence: sound sources, mixer, equalizers, active filters
and power amplifiers. Power down the equipment by following the inverse sequence. This way the peaks
or transients produced by powering up / down a device do not affect the following one in the audio chain
and, as a result, they do not reach the loudspeakers, which are the most vulnerable audio elements in
this case.

4.2. Monitoring

The GOA7C is equipped with an acoustical and visual monitoring system, through headphones,
CONTROL ROOM output and VU METER. When switching ON any of the PFL buttons, signal(s) present
at the input(s) will be seen at the VU METER. If no switch is at the ON position, the signal present at the
main mix bus is heard (open faders). By pushing the MASTER A / MASTER B buttons, the right VU-
Meter displays the signal present at the output 1 or output 2. If no switch is at the ON position, the signal
present at the main mix bus is shown (open faders)
It is also possible to monitor through the C. ROOM (42) output. This output carries the very same
signal as the headphones output does. Its nominal output level is 0dBV (1V) and it is controlled by the
rotary knob CONTROL ROOM (29).

4.3. Channel gain and equalization

These controls allow individual input sensitivity and tone adjustments for each channel.
Thanks to the GAIN (2) control, you can precisely adjust the signal level of an incoming musical
signal to match the level of the music that is playing on air through another channel. This operation may
be performed visually (through the left VU-meter) and acoustically (through the headphones),
successively comparing both signals with the PFL buttons. The Gain knobs offer an adjustment range of
±20dB.
The tone controls (3-4-5) of channels 1, 2, 3 and AUX have a range of -20 to +10dB, while
channels 4, 5 and 6 range from CUT to +10dB.

4.4. Using the CROSSFADER

The GOA7C provides a short travel sliding potentiometer placed horizontally. This potentiometer
is called CROSSFADER (32) and enables a direct mixing of the signals present at the inputs. The odd
channels 1, 3 and 5 feature a A switch with activation indicator, that assigns this channel to side A of the
crossfader. If these switches are not activated, the signal bypasses the crossfader circuit and passes
directly to the main mix bus. An analogue B switch at the even channels 2, 4 and 6 assign these signals
to side B of the crossfader or direct them to the main mix bus.
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