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Q2 OPERATION AND MAINTENANCE MANUAL 9601 20
INPUT MODULE
The input module is essentially the same for all subgroup versions
of Q2, with links selecting whether the buses feed 8 mono, 8 stereo,
4 LCR or 16 mono subgroups. Dedicated LCR input modules have
4 routing buttons marked A, B, C, and D instead of buttons 1-8.
MTR
This sub-panel preset is for calibration of the external meter output
of the module.
48V
Provides phantom power for a condenser microphone, or DI box.
Optional balancing transformers may be fitted on the Mic input.
-20dB (PAD)
This inserts a 20dB attenuator in circuit with the Mic input. It may
be used when high-output microphones are employed, or for the
use of the Mic input for Line-level signals.
GAIN
The gain control is a wide range rotary potentiometer, and is active
on both Mic and Line Inputs. On Mic, the gain can be adjusted
from 12 to 66dB. For Line inputs, the adjustment is from -10 to
+20dB.
LINE
The LINE switch selects the signal on the line input socket to feed
the channel path when it is down. In this case, the Mic signal is
disconnected. The led illuminates when Line is selected.
PHASE
The PHASE REVERSE switch inverts the phase of the selected
input, to allow compensation for different wiring standards.
FILTER
The Filter switch inserts a tuneable highpass filter with a roll-off of
12dB per octave into circuit after the input amplifier. This may be
used to eliminate unwanted low-frequency noises such as rumble,
or camera buzz.
FILTER FREQUENCY CONTROL
The frequency range of the filter is continuously variable between
20Hz to 500Hz.