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Nothing fancy but going by the green good, red bad method works well. I had replaced the speakers in my car and couldn't get it to sound right. I was fairly confident that it was wired right but no changes to the head unit eq helped. After installing this it took about 2 minutes to diagnose polarity problem because of non-matching adaptors, and all fixed and checked within the hour.
★★★★★Ivan Porcalla· Feb 22, 2019
Works well. Just have to adjust the threshold and do 5 samples per speaker. Used it in my car speakers. I just found out that my right front newly-installed speakers were out of phase. Just copied the audio test files in a thumb drive, played the tracks repeatedly and got a pretty accurate reading. Just park somewhere quiet.
★☆☆☆☆Swerving Lemon· Aug 19, 2023
Certainly doesn't produce data you can trust. In a quiet room, the phone detects its OWN speaker as being anaphase. I could believe that, but it only detects itself as anaphase about 70% of the time. I'm not switching the polarity, so what gives here? Timing issue?
★☆☆☆☆R zinski· Oct 8, 2021
I really had high hopes for this app to resolve some issues with multi amped 3 way speakers. I found no way to use the app, no sound was produced, could not get the app to even respond to any taps. Another useless audio app, I have yet to find an audio apps that can produce any useful info or perform any real tests that can be used to make adjustments to correct any issues. Most can't use an external mic and produce blue tooth sounds to do any testing?? This is the only way it will work!
★☆☆☆☆nazir kader· Aug 23, 2020
Not reliable, sometimes it shows the polarity is right, sometimes it doesn't, do a battery test, the best way I would recommend
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