BSS Audio DPR-402 Owner's Manual - Manual (Page 27)

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To aid the correct setting of the FREQ control in relation to the audible
sibilance, the source program can be listened to through the internal de-ess
filter by depressing the MON S.C. switch. This replaces the normal signal at
the output connector with the output of the de-ess filter.
The effect of de-essing at various frequencies on a program is shown in figure
12.3.
Fig 12.3 Effect of
de-essing on output
Referring back to section 3, the problems with high frequency transients
causing distortion further down the equipment line were discussed. The peak
limiter of the DPR-402 provides an extra stage of gain reduction, with
dynamics specifically set for these fast transients. It is used in conjunction
with the main compressor section and provides an output limiting function to
control the fast transients which would generally be missed by the slower
dynamic settings of the compressor. The attack and release times are set
internally to suit the limiting application, with a choice of FAST or SLOW
response selected by a switch on the rear panel (refer to section 9). It is
preferable to use the FAST response setting, providing this does not cause
audible distortion, otherwise the SLOW response should be used.
The peak limiter threshold is unaffected by the GAIN control, and is set by the
PEAK LIM control, which is scaled directly in dBv. The ratio is set internally
to 20:1. A green LED is provided to indicate when limiting begins, and a red
LED indicates when heavy limiting occurs (above 10dB) (See figure 12.4).
This red LED indicates that more than optimum peak limiting is being used,
and the output gain control should therefore be backed off, so that it only
flashes on occasional peaks.
Fig 12.4 PEAK LIMITER
controls
12.4 Peak Limiting