Refine the compressor THRESHOLD setting so that the compressor display shows the amount of
gain reduction desired when the signal is within the operating range of the compressor. For
most applications, 3 to 6 dB are all that's necessary. Choose a
RATIO setting appropriate for
your application: gentle level control demands low ratio settings (below 6:1), peak leveling
requires higher settings (8:1 or higher). Choose a
RELEASE time accordingly: percussive
sounds like fast release times, speech and music like slower times. These settings are just
guidelines, you can use whatever setting actually works.
If you're using a large amount of compression, for leveling or automatic gain control, you may
need to adjust the output
GAIN control to add makeup gain to compensate for the signal level
lost to the compressor. You can set the makeup gain easily by comparing signal levels via the
IN/BYPASS switch and adding gain via the GAIN control
Refine the peak limiter
THRESHOLD setting so that the peak limiter display only shows gain
reduction during the highest peaks, and then only momentarily. Large amounts of gain
reduction showing on the peak limiter's display indicate that the limiter
THRESHOLD setting
may be too low. If this is what you want, fine, but bear in mind that peak limiters are designed
to stop occasional peaks dead, and may not sound very pretty used semi-continuously. May
we suggest using the compressor with the ratio control set at maximum.
6.5 Stereo Coupling
If you are using the 425 for a stereo signal, say for a stereo mixdown, depress the LINK switch
so that the
STEREO LED is lit. This disables the channel 2 control channel, and slaves the two
VCAs together. Channel 1 's sidechain receives an equal mix of the two input signals. Only
Channel 1's controls work (they control both channels now). The end result is the gain
reduction applied to the two channels is identical, which prevents stereo image shifts caused
by unequal gain reduction in the two stereo channels.
6-3
Rev 2.0, 10/29/93
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