Lexicon RV-8 - Manual (Page 135)

RV-8 Audio Controls
4-3
The BASS parameter controls the amount of low-frequency boost or cut applied to the
Main Zone audio output connectors labeled Front L/R, Center and Sub.
BASS Parameter Settings
The TREBLE parameter controls the amount of high-frequency boost or cut
applied to the Main Zone audio output connectors labeled Front L/R and Center.
TREBLE Parameter Settings