BSS Audio DPR-404 Owner's Manual - Manual (Page 22)

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The effect of Compression
11.1 Compression
11.0 The effect of Compression 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
2.2a & 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 11.1a High threshold
level
Fig 11.1b Lower
threshold level
Fig 11.2a Effect of
compression with high
threshold
Fig 11.2b Effect of
compression with lower
threshold