a/d/s/ PH30.2 - Manual (Page 16)

internal signal routing
2-channel/4-channel input switch - routes RCA input from channels 1/2 to channels 3/4.
When the switch is engaged, channel 1 input is
routed to both amplifier channels 1 and 3 with input
channel 2 routed to amplifier channels 2 and 4.
Switch in the engaged position.
When the switch is disengaged, channels 1, 2, 3,
and 4 receive signal individually from their
respective inputs.
Switch in the disengaged position.
Level controls - Independent level controls for channels 1/2, 3/4 and 5/6 adjust
the input sensitivity from 100 mV to 8 VRMS.
Output - Three position switches determine the output configuration. Each stereo pair of channels can
be configured in either stereo, summed-bridged and bridged-mono.
When the switch is in the left position, the output channels are configured for
stereo operation.
When the switch is in the center position, the output channels are configured
for summed bridged operation by mixing the left and right input signals
together.
When the switch is in the right position, the output channels are configured
for a bridged mono output using a single RCA input. Ch 1 input is used for
channels 1 & 2, ch 4 input is used for channels 3 & 4 and Ch 5 is used for
channels 5 & 6.
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