11
MXS2800 Power Amplifier
Bridge Mode
The MXS2800 power amplifier provides a
rear-panel switch that allows it to be used
in either a Stereo or Bridge mode. When
this switch is placed in the STEREO position,
the MXS2800 functions as a true stereo
amplifier, where both of the two independent
amplifier channels (Ch A and Ch B) can
receive different input signals and produce
independent output signals. However, when
the switch is placed in the BRIDGE position,
the Ch A input signal is routed to both power
amplifiers bridged together, producing a
single output signal.
The illustration on the left shows how this
works. In Bridge mode, the polarity (phase) of
the Ch B output signal is reversed relative
to that of the Ch A output signal. Both
channels then process the same input signal,
with the speaker load connected so that
power is derived from both channels. The
effective voltage swing seen by the load is
thus doubled, so that the power output is
multiplied by four.
When using the MXS2800 in Bridge mode,
connect the amplifier to a loudspeaker using
a Speakon® connector plugged into the CH A
output, wired +1 for the positive input of the
speaker and +2 for the negative input of the
speaker.
INPUT
Bridge Mode
CHANNEL
1(+) OUTPUT
CHANNEL
2(+) OUTPUT
Bridge Wiring
+1 +2 Connected
1- 1+
2+ 2-
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