Drawmer 1960 Mic-Pre/Tube Compressor - Manual (Page 7)

1960 OPERATORS’ MANUAL 5
CONTROL DESCRIPTION AND OPERATION
W ith the exception of the Aux preamp section, both channels of the 1960 are identical
and may be used independently or linked for stereo operation. In linked mode, the
compressor controls should, ideally, be set to the same settings (as the control-circuitry
for both channels responds to the average between the two channel settings). In Stereo
Link mode, both channels track together to avoid the inevitable image shifting that would
occur if the two channels of a stereo signal were treated independently.
COMPRESSOR
Source Select: This rotary switch selects the compressor input source. The
Line and Mic inputs are via the rear-panel XLRs while the
Aux input is available on the front panel. The two Mic
positions offer an input with or without +48V phantom
powering, with a red LED lit when active.
Note: if the Aux input is to be used at the same time as a Mic input, it is
recommended that the Mic input be processed through the upper channel
and the Aux input through the lower channel as this minimises crosstalk
between tube amplification stages sharing the same envelope.
High-pass: The signal path incorporates a switchable high-pass filter
which may be set to 50Hz, 100Hz or Off. Its use is to
attenuate low frequency signals that might otherwise prove
troublesome, eg. traffic rumble or stage vibration.
Threshold: Determines the input level above which gain reduction will
be applied and may be set in the range -24dB to infinity.
Because the compression system is based on the Soft Knee
principle, the onset of compression is progressive, so no
Ratio control is necessary.