4-channel amplifier

  
Rear channel `ambience` can be added to an existing stereo system to extract a difference signal (R - L or L - R) which, when combined with some direct signal (R or L), adds fullness, or `concert hall realism` to the reproduction of recorded music. Very little power is required at the rear channels, hence an LM1877 suffices for most `ambience` applications. The inputs are merely connected to the existing speaker output terminals of a stereo set, and two more speakers are connected to the ambience circuit outputs.
4-channel amplifier  - schematic

The rear speakers should be connected in the opposite phase to those of the front speakers, as indicated by the +/- signs.




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