Automatic speaker calibration is a choice on quite a few receivers that makes it simpler to calibrate the speakers. The receiver sends test sounds to every speaker and subwoofer, and monitors the seem which has a microphone. Stereo receivers have two channels, and may be used to play stereo audio. https://caidenneviu.rimmablog.com/33481311/the-greatest-guide-to-4-zone-amplifier