Mono Bridging a Stereo Amplifier

Last Update: 12/29/2003

Mono bridging a stereo amplifier allows the left and right channels of the amplifier to go to a single speaker thereby doubling the wattage applied to that speaker. Some Yamaha stereo amplifiers such as the P2200, P2201, A100A, and the XH150 do not have a built-in system for bridging their stereo amplifiers across a single load. Despite this limitation it is possible to mono bridge a stereo amplifier that is not equipped with a bridging capability by splitting the signal which feeds both amplifier inputs and reversing the polarity of one of the signals. This can be accomplished through the use of a balancing transformer found in most HI-Z to LO-Z passive convertor boxes.

Wiring Instructions:

  1. Connect the input source signal to the primary side of the balancing transformer.
  2. Connect the 0 degree polarity signal (Normal Phase) on the secondary side of the balancing transformer to the input for channel 'A' on the amplifier.
  3. Connect the 180 degree reversed polarity signal on the secondary side of the balancing transformer to the input for channel 'B' on the amplifier.
  4. Connect the ( + ) output of channel 'A' to the speaker's ( + ) input.
  5. Connect the ( + ) output of channel 'B' to the speaker's ( - ) input.

NOTE: When bridging a stereo amplifier the ground connections (black) of the output are ignored.

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