Great Product!

I had to splice unlabeled wires together on my 7.1 surround setup and could get the phase right. I had a significant drop in bass response. I downloaded this app, hit their web site and played the calibration file while testing each speaker. 5 of them were out of phase! 5 minutes later I had everything in phase and rocking! This saved me hours of wiring work and 30 bucks in speaker wire. Excellent app!!!!

Pixel67 about Speaker Polarity, v2.3