BSS Audio DPR-402 Owner's Manual - Manual (Page 35)

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MODE CONTROL
S/C LINK SUBTRACT
S/C LINK
AMPLITUDE CONTROLLED MIXING (2)
As above, but the external signal will be
summed with the main signal, but this time
under control of the same, or another,
external control input.
EXT SIG
to G
(sum) EXT SIG
to B
(control)
These two modes may be used to good effect when the external signal is an
echo return or delayed signal. For example, a single voice can be
automatically chorused above the set threshold.
15.3 Stereo Linking When stereo signals are compressed, it is necessary for the gain of both
channels of the compressor to be identical at any moment in time, otherwise
the stereo image will move around the sound picture as the relative levels of
the left and right hand signals vary. Stereo linking couples together the
compressor control signals, so that the VCAs in both channels work together,
as in a stereo fader.
It should be noted however that, when in stereo linked mode, the standard DE-
ESS and PEAK LIMITER functions continue to operate independently for each
channel, and are not part of the stereo linking.
There are three possible ways to stereo link of the DPR-402:
When the rear panel STEREO LINK switch in ON, both channels are couples
together, and the LINK LED illuminates on the front panel.
In this mode, it is important that the compressor controls are set identically for
both channels.
Stereo Link Switch
The stereo coupling point is available at connection M on the BARRIER STRIP,
and up to four channels may be coupled together by simply strapping these
pins together. Screened cable will not normally be required if the wiring is
short, unless there are strong local interference fields present.
In this mode, it is important that the compressor controls are set identically for
all channels.
Hard Wired Stereo and Multiple Channel Linking
In this mode, only the controls on Channel 1 compressor will be required to
control both channels, as the control signal for channel 1s VCA is used to
drive that on channel 2. This gives excellent stereo matching without the
need to adjust both sets of compressor controls. Two 10k ohm, ¼ watt, 1%
resistors are required to sum the left and right signals into channel 1
CONTROL S/C RETURN input. The rear barrier strip should be wired as shown
(See figure 15.2), and the controls set as shown overleaf.
Improved Stereo Coupling