Samson Power Amplifiers Owner's Manual download pdf (Page 12)

Bridge and Parallel Modes

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 more

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 Series 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.

INPUT

Bridge Mode

CHANNEL

1(+) OUTPUT

CHANNEL

2(+) OUTPUT

Bridge Wiring

+1 +2 Connected

1- 1+

2+ 2-

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Samson Power Amplifiers Owner's Manual Page 12