Can you walk me through how to use this app?
Like I said, the app is called Polarity Checker on the Google Play store. After downloaded, you simply start the app, and press the play button. The app generates pulses, which sounds like clicks that are spaced a couple of seconds apart. As the pulses are generated, you simply place your phones microphone close to the speaker you are checking and the app indicates whether the pulse receives matches the pulse generated. If a phase match is determined, the app shows a big green + sign. If the pulse received is out of phase, the app shows a big red - sign. This is the first time I've used the app, but my process was to determine the phase of each of the factory speakers, and then make sure the Infinity's were the same.
I've read that others have stated that the polarity of one or more speakers may be intentionally out of phase for the ANC (Active Noise Cancellation) system to work properly. I haven't done much research on this yet, but I was just trying to make sure I matched the polarity of the factory setup. As stated, my left and right dash speakers needed to have the polarity on the Metra adapter switched to make the Polarity Checker app pick up and match correctly. I thought for sure the center channel would need the same, but for some reason, it didn't.
I want to tear everything apart and check again, and probably will do so soon. Just the engineer in me