Burst Electronics AS4x1 - Manual (Page 4)

2 AS4x1 Audio Switch
Monitor Amp
The built in monitor amp will drive the internal 3" speaker or
external headphones or speakers. There is a separate
summing amp that drives the internal speaker. This amp
sums the L and R channels.
The front panel monitor amp output is stereo via a 3-
conductor 3.5 mm jack. The volume is set by the front
panel control. This control has no effect on the rear
outputs.