BSS Audio OPAL Series DPR-944 Owner's Manual - Manual (Page 31)

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increased. The net effect, therefore, is for both ends of the dynamic spectrum
to be pushed (or squeezed) towards each other. This squeezing effect of
compression is important to remember, and provides a major difference
between compression and limiting. I.e. Limiters do not make-up the gain
reduction.
The range provided by the DPR 944 on its ratio and release controls is
sufficient to allow its use either as a compressor or limiter. For limiter
applications, the release fast switch should generally be out.
10.4 Frequency
selective
compression
As described above, conventional compressors affect the whole audible band
of frequencies equally. Some compressors, can be configured to only start
compression when they encounter given frequencies, however, once they start
compressing they again compress the whole audio band. This is quite distinct
from the type of compression available from the DPR 944. This can be set up
so that when it encounters a given band of frequencies it compresses only that
band, this is a very different technique from simple equalisation and is vastly
more powerful for both corrective surgery and creative manipulation.