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DYN. COMP.:
Dynamic range compression (DRC) or simply compression is an audio signal processing operation that
reduces the volume of loud sounds or amplifies quiet sounds thus reducing or compressing audio signals
in DYNAMIC RANGE. Compression is commonly used in sound recording and reproduction,
broadcasting, live sound reinforcement, and some instrument amplifiers.
THRESHOLD
A compressor reduces the level of an audio signal if its amplitude exceeds a certain threshold. The threshold
is commonly set in decibels (dB), where a lower threshold of -70 dB means a larger portion of the signal is
treated. When the signal level is below the threshold, no processing is performed and the input signal is
passed, unmodified to the output. Thus, a higher threshold of 0 dB, results in less processing, and less
compression.
RATIO
When the signal becomes louder than the threshold, the compressor reduces the gain based on the ratio
setting. Without getting too mathematical, the ratio of a compressor determines how much gain reduction
is applied to a signal after it crosses the threshold.
With a ratio of 2:1, for every 2 dB above the threshold, the compressor only allows 1 dB above the
threshold through. With a ratio of 4:1, for every 4 dB above the threshold, the compressor only allows
1dB above the threshold through. With a ratio of 10:1, for every 10 dB above the threshold, the
compressor only allows 1 dB above the threshold through.
PHASE:
This option was created to control the phase of the microphone by flipping the phase to prevent PHASE
CANCELLATION. By rotating the knob of the PHASE, you can flip it 180°.
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