1188 posts · Joined 2016. #5 · Mar 20, 2017. You need a calibrated microphone. Microphones are just like speakers can alter sound. You want the receiver to hear EXACTLY what the speakers are putting out. 7.2: Yamaha RX-A830 | Klipsch Synergy F30 + C20 + Sub12x2 + Onkyo HTIB Surrounds | Epson HC2040 Silver Ticket 120 inch Grey Screen. More @Wikipedia
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