BSS Audio OPAL Series DPR-944 Owner's Manual - Manual (Page 30)

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10.3 The effect of
compression &
limiting on sound
Consider an input signal which is applied to two units, one having its
threshold point set 10dB higher than the other. Since the compressor only
affects signals that exceed the threshold level, the signal with the lower
threshold applied will be more affected than the other. Referring to figures
Fig 10.3b Lower
threshold level
Fig 10.3a High threshold
level
General guide to compressing
Comparing the input and output waveforms for the compressed mode, the
loudest portions of the signal have been effectively decreased in level, and if
the gain control is adjusted to compensate for this, the quieter portions will be
10.4a & b, assuming that all other controls on both channels are set
identically with gains equalised, it is immediately apparent that the signal
processed with the higher ratio is said to have been limited, whereas the
signal with the lower ratio is said to have been compressed.
Fig 10.4b Effect of
compression with lower
ratio
Fig 10.4a Effect of
compression with high
ratio