Diamond D9 & TDX TECHNOLOGY Owner's Manual page 16

D9 800.4
1/2 Mono Enable
Pushing this button "IN" creates a mono signal for use with subwoofer systems. When
mono mode is selected, only RCA input channel 1 is used. Leaving the button "OUT"
defaults the amp to normal stereo mode.
3/4 Mono Enable
Pushing this button "IN" creates a mono signal for use with subwoofer systems. When
mono mode is selected, only RCA input channel 3 is used. Leaving the button "OUT"
defaults the amp to normal stereo mode.
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