Compressor - miniDSP 2X4 HD User Manual

6.3.6 Compressor

The compressor reduces the gain of an output channel when the audio signal reaches a certain level as specified
by the Threshold parameter. The gain of the channel will be progressively reduced as the signal increases above
the threshold, according to the Ratio parameter. This can be used to limit the power delivered to speakers and
thus reduce the risk of damage from overdriving.
This screenshot shows an example Compressor setting:
(Note that the compressor algorithm is bypassed by default, so click on the Bypass button to see the curve as
shown here.)
In this example, the threshold is set to -20 dB, so the compressor will activate when the signal on that channel
reaches -20 dB (relative to full output). The ratio is set to 2, so if the input signal level to the compressor then
increases by 10 dB, the output level will increase by only 5 dB. If the input signal level to the compressor is at full
scale (0 dB), then the output level will be limited to -10 dB.
Two additional parameters control the action of the compressor: the attack time and the release time. These
two parameters govern how quickly the compressor activates when the signal level exceeds the threshold, and
how quickly it deactivates when the signal level reduces. The optimum settings may need to be tuned by ear. For
more information, see the Wikipedia article Dynamic range compression.
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miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice