Dolby Laboratories 430 - Manual (Page 11)

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It is usually better to locate the console channel fader after the Model 430 unit. Gain riding the Model 430
input can allow dialog to move into the expansion band resulting in unexpectedly increased dynamic range.
Also, when the Model 430 is being used to reduce reverberation the process can change the perceived
loudness of the track (even though levels around nominal are virtually untouched). The fader can then be
used to restore the perceived loudness without affecting the noise suppression thresholds.
If a track has been recorded at much lower than nominal level, (i.e., not riding around the level of the three
center LEDs on the meter with the uncal pot out and fully clockwise), it is important to bring up the send
signal to the Model 430 with the console’s line gain control rather than raising the fader to bring up the
processed level.
The use of compression in the chain containing the Model 430 is to be avoided wherever possible.
Compression will counteract the effect of the suppressor by raising background noise.
If the level of suppression is high, peaks can sometimes sound objectionable. The use of a peak limiter after
the suppressor can be useful in this case. Its threshold should be set about 6 to 10 dB above nominal level.
This will trim back the peaks of dialog and give a more balanced track. Attack and release times should be
set to roughly syllabic rate (around 10 ms attack and 150-300 ms release) to minimize the audible effect of
the limiter.
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