search for: 160khz

...'halves' in the groove. Each channel is actually BOTH the front channel added in a linear fashion to the BACK channel information which is riding on a 'carrier wave.' If I recall correctly (and I probably don't) the back channel is AM coded on a high frequency signal (80khz or 160khz comes to mind.) A quad capable receiver de-multiplexes the back channels and subtracts them from the baseband signal to send only the front signals to the front speakers and back signals are then sent to the back speakers. I now return you to an on-topic list.... Myles --- >8 ---- List archi...