FORUM OPERATION AND MAINTENANCE MANUAL 9601
PAGE 58
TALKBACK MIC
A microphone may be plugged in to this socket to provide talkback
facilities to the output buses for artists or tape. The microphone
may be a Dynamic type, or using an internal link for phantom
powering, may be a condenser microphone.
TB GAIN
This adjusts the level of the talkback microphone signal.
1-2 / AUX
If 1-2 is pressed, the talkback microphone signal is sent to the
Auxiliary 1 and 2 buses. If these buses are being used as artists
headphone feeds, this switch allows the engineer to talk directly to
the artist via the headphones. To avoid feedback the control room
output is muted when talkback is used.
ALL
If the ALL button is pressed, the talkback microphone signal is sent
to all the main outputs, including all auxiliary buses, group outputs
and the stereo mix, for use in global announcements. The control
room monitor outputs are muted completely when ALL is pressed.
OSC LEVEL
This pot controls the level of the internal tone oscillator, which may
be used for signal path testing or equipment alignment. The
oscillator operates at a frequency of 1kHz.
ON
Switches on the oscillator for use as above, and routes the oscillator
signal to all the buses Q stereo mix, auxiliary outputs and group
outputs. If either of the Talkback assign switches are pressed, the
oscillator signal is overridden.
MONITOR LEVEL
This controls the level of the control room monitoring system. The
signal feed to the monitoring system is selected from the stereo mix
output, an external stereo input Pfor example, a master stereo tape
machine), or any signal on the mixer which is SOLO'ed.
The output Pcontrol room) will feed an external power amplifier
and speakers. Alternatively, stereo headphones may be used via the
headphone jack on the front panel of the master module.
