Samson MXS Serie Manuel De L'utilisateur page 10

Bridge and Parallel Modes
INPUT
CHANNEL
1(+) OUTPUT
CHANNEL
2(+) OUTPUT
Bridge Wiring
1- 1+
2+ 2-
+1 +2 Connected
10
Bridge Mode
The MXS amplifiers provide a rear-panel
switch that allows it to be used in either
a Bridge or Parallel mode. When this
switch is placed in the STEREO position,
the MXS amplifier 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 binding post outputs in
Bridge mode, be sure to connect your
loudspeaker with the red (+) terminal of the
Ch A output connected to the positive input
of the speaker and the red (+) terminal of
the Ch B output connected to the negative
input of the speaker. Do not use the black
ground (-) output terminal of either channel.
You can also use an 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.
When the rear panel switch is placed in
the PARALLEL position, the MXS amplifier
operates in an input parallel mode. In this
mode, only the signal present at the Ch A
input is used. This signal is then routed to
both the Ch A and Ch B power amplifiers,
thus producing a dual mono output.