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chaudio wrote: If you connect the third speaker as you would in bridge mode, across the left and right positive channels, the speaker will receive the difference between left and right. The earliest surround sound encoding worked roughly on that principle so if you put the third speaker behind you while listening to suitably encoded tracks you'll get a basic surround sound effect. Works well on Star Trek - TNG actually, you get the sound of the ship (low rumble/hum type sound) coming from the rear speaker.