Calrec S2 Operator's Manual page 113

S2
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DL3678 COMPRESSOR/LIMITER DIL SWITCHES
SW4 "M" detection:-
DOWN = OFF.
UP = ON
N.B. The compressor and limiter normally respond to the higher of the left and right signals. SW2
allows the mono reduction of left and right (-3dB) to take control it the stereo coherence is such that
this exceeds left or right. This renders it unnecessary to "under-drive" the stereo outputs to guard
against the possibility of a higher than desired mono level.
= Detection of reduced mono signal into side chain (see note).
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