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.

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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