Bypass.
The Compressor In switch allows the processing to be bypassed for comparison of the
compressed signal (with any gain make up that has been applied), with the original
signal.
Stereo Operation.
Two 3051 voice processors may be configured for stereo operation of the compressor
section by inserting a Link cable between the two units. In this mode, the control
voltages are linked, ensuring that the same amount of gain reduction is applied to both
channels (even if one signal is below the threshold). This ensures that the stereo image
is preserved. To active this mode, the Stereo Link switch should be depressed on both
3051’s.
Ducking or Gating.
A variation on stereo operation as described above is master-slave operation, where
the gain of one 3051 is controlled from another unit, but without reciprocal action.
This is useful where a voice channel input is required to reduce the gain of, for
example, background music when the microphone signal is present.
The link cable should be fitted, as for stereo operation, but the Stereo Link switch
should only be depressed on the “slave” 3051 (the backgound music channel in the
example above). If the compressor is switched out on the master unit, gain reduction
will only occur on the slave unit. The threshold and ratio controls on the master 3051
will determine the extent of the gain reduction in the slave unit.
Equalisation.
The 3051 equaliser section has four bands, each with continuously variable cut and
boost control. The mid bands also have continuously variable frequency sweep
controls.
LF Band.
The LF (Low Frequency) band of the equaliser has a shelving characteristic - i.e. it
extends from the selected frequency to the extreme low frequency limit of the
equaliser’s response.
The corner frequency of the LF band is selected by a push button to 120Hz or 80Hz,
and the cut or boost is controlled by a continuously variable, centre-detented rotary
knob. At the selected corner frequency, up to 15dB of cut and boost are available.
Typical response curves are shown in the specification section of this manual.
