AMS NEVE 8051 - Manual (Page 8)

Sidechain Link
The sidechain link buttons route audio from each channel's sidechain audio path into one or both of
the sidechain timing circuits. If a single channel's SC LINK A or B button is pressed, that channel will
behave as a mono compressor.
If another channel is then linked to the same sidechain, the timing circuit responds to whichever
channel is larger at any moment (taking into account the setting of the SC trim controls). The
resulting control voltage is then applied equally to both channels, i.e. they behave as a stereo linked
compressor.
Sidechain Filter
Inserts a high-pass filter in the channel's sidechain path, preventing unwanted compression due to
LFE content. The response is 12dB/octave, shelves at -20dB (this is required to maintain the
sidechain's phase margin) and has a selectable -3dB frequency of 80, 100, or 120Hz.
8051 5.1 Compressor User Guide
Issue 2 Page 6