Polarity Checker

Contains ads
3.9
1.24K reviews
100K+
Downloads
Content rating
Everyone
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About this app

For a good working Sound System it is essential that all loudspeakers are wired correctly.

With this app you can turn your android device into a "polarity popper" and check the "polarity" of a speaker, whether it first moves forwards or backwards (often mistakenly named "phase", which is also time and frequency related).

A loudspeaker should have the same polarity as it's "friend on the other side" when measured at the same position/distance. This also counts for multiple speakers which should be doing the same (a cluster of multiple subwoofers for instance).

Important notes:
- Red is NOT bad!! A lot of filter-designs that drive loudspeakers have out of polarity components (so for instance the high frequency speaker CAN be opposite polarity to the low frequency speaker).
- Try to measure as close to the speaker as possible (and away from bass-ports).
- dBFS means "Decibels relative to full scale". So 0dBFS is the maximum soundpressure your device is capable of handling without distorting (clipping).
- Using a different pulse signal CAN give opposite readings, due to loudspeaker filter designs. Use the same pulse when comparing!

Polarity Checker can be useful for testing almost all sound sources. Like large scale concert PA systems, home theater systems, studio monitors, car audio en even headphones..

Usage:

For playing the pulse signal you have 3 options:
- Use a wire to connect your phone/tablet to the Sound System.
- Use 2 phones/tablets (one wired for pulse generation and one without wires for measuring).
- Copy the pulse files (which can be found in sd-card/PolarityChecker) to a playback medium (cd/iPod) that is able to repeat single tracks.
- When the polarity-reverse button "Ø" is pressed (red), the pulse generator plays a negative pulse. So the measurement should give opposite readings! (equal to playing an INVERTED_pulseXXXX.mp3 file)

Measuring:
- Avoid CLIPPING the microphone, this could corrupt the measurement.
- Adjust the threshold, so the checker doesn't get triggered by background noise.
- Try to measure one speaker at a time. If possible mute all other sound sources.

When measuring "passive filtered" speaker cabinets (for instance when you've got one amplifier driving your low and high speaker at the same time), it can be useful to select a frequency dependent pulse to isolate the speaker you want to measure.

If you like this app, please comment and rate. If you've got any questions, bugs or feature requests, please visit the facebook page: http://www.facebook.com/PolarityChecker

PERMISSIONS USED:
- RECORD_AUDIO: To use the mic input of the device
- STORAGE: Needed to copy the pulse files to the sdcard
- FULL INTERNET ACCESS: Needed for Ads (not used when donation key is purchased)
- VIEW NETWORK STATE: Needed for Ads (not used when donation key is purchased)
Updated on
Apr 12, 2013

Data safety

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Ratings and reviews

3.9
1.2K reviews
Jim P
March 13, 2022
Update: In a 2016 F150 this app did not work with Bluetooth on a Pixel 6 Pro. I assume it's because it needs to use the mic on the phone. However, with a very long USB cord and Android Auto, it works! And, much to my surprise, the front right was out of polarity. Both the wolfer and the tweeter, so, this was an easy fix at the crossover.
6 people found this review helpful
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Frank Pultz
April 24, 2022
Had sound issues in my vehicle with a shop installed AC lc7i stock head unit. To me it sounded like the speakers were out of phase. I was going to use a multimeter to check it and stumbled upon this app. I thought what the heck I'll give it a try. Low and behold 3 of the 4 speakers were out of phase. Got them in phase and it sounds right now. For me this app worked.
7 people found this review helpful
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Robert Struzinski
October 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 uselfull 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!
12 people found this review helpful
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What's new

- Added: Move to SD support