NOTE The ability of the expander to discriminate between wanted and unwanted
signals is partially determined by mic technique. Be particularly careful of high
frequency sounds entering the side or rear pattern of a cardioid mic. Most
cardioid mics exhibit a sharply rising off-axis response characteristic at higher
frequencies. Check the off-axis curve (the lower one) in the manufacturer's
literature. If there's only a 3dB to 6dB difference between the on-axis (frontal)
response and the off-axis (side or rear) response in the 5kHz to 10kHz reason,
high frequency sounds will be picked up by the side or back of your mic.
Use the mic's directional pattern to keep other sources as far off-axis as
possible - do everything you can do to extract all the source-to-source
discrimination possible through good mic technique. The sounds picked up by
individual mics must be primarily the sound of the desired signal, or the
expander won't be able to tell the difference.
Hint: You can save time, and make life easier by listening to the output of the
equalizer (instead of the 425's output) that you're using in the sidechain. Doing
this allows you to hear the signal that will control the 425, and perhaps to find
the range that you wish to emphasize or de-emphasize more easily.
2-5
Rev 2.0, 10/29/93
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