2 4
application in which the compressor is to be used.
Hiss and signal processor idling noise are common sound reinforcement
problems. The more signal processors there are in line with the program
material, the more noise is produced at the final output stage. For this rea-
son DOD has incorporated a noise gate in the 866. A gate acts like a com-
pressor in reverse. When a signal crosses the gate threshold, it is allowed to
pass unaffected. When the signal level falls below the gate threshold level,
the signal gain is attenuated, effectively shutting it off. The Gate Threshold
control of the 866 allows the user to adjust the threshold level of the noise
gate. When the control is in the fully counter clockwise position, the noise
gate is inactive and all signals will pass through.
The Output Gain control allows the user to make up for gain lost in the com-
pression process and to set the output level of the compressor for compati-
bility with other equipment.
Here are a few compressor settings that can serve as a starting point for the
applications covered up to this point:
Vocal Compression:
Compressor Threshold: low
Ratio: 5:1
Attack: 10 msec
Release: 200 msec
Guitar Compression for Extra Sustain:
Compressor Threshold: low
Ratio: 15:1
Attack: .5 msec
Release: 500 msec
Protective Limiting:
Compressor Threshold: high
Ratio:
∞
:1
Attack: 0.1 msec
Release: 90 msec
For more information on compressors and applications, consult the Yamaha
Sound Reinforcement Handbook (Hal Leonard Publishing, #HL 00500964).
This book is an invaluable tool for beginners and veterans alike, and contains
a wealth of information on sound reinforcement theory and practical applica-
tion.
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