Polarity Checker

Polarity Checker


(3 stars)


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10,000 - 50,000 downloads

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

With this app you can 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..


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)

- 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

- 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)

Search tags: popper, pop, plopper, sine, inwards, outwards, cancellation, stereo, positive, negative, reverse

Tags: phase checker, polarity checker, polarity checker speaker, speaker polarity checker, speaker polarity tester, speaker phase checker software, speaker phase checker freeware, audio polarity checker, audio phase checker, phase checker software.

Recently changed in this version

- Added: Move to SD support

Comments and ratings for Polarity Checker
  • (46 stars)

    by James Pickering on 27/04/2014

    I have no way of really checking if it is correct but several checks produced consistent results. Saved me a packet getting my car's sound system installed as I could do it myself.

  • (46 stars)

    by Tom Clarke on 26/04/2014

    Love this app. Accurate, and so easy to use. I had a multi speaker system that I thought was wired correctly. After checking with this app I found one speaker polarity to be incorrect. After reversing the polarity the sound is fuller and richer. Brilliant!

  • (46 stars)

    by Yudi Kurniawan on 05/02/2014

    When i checked phase of my midbass in my car, didn't worked well. The + - sign dont show the right one. Although i've changed the frequency. I compare this app with a polarity checker tool.

  • (46 stars)

    by Casey Wilkinson on 13/11/2013

    Works great. Kept me from having to take off all my door panels to get to speaker terminals. Thanks!

  • (46 stars)

    by Michael De Salvo on 28/07/2013

    Just used it for car stereo, works great

  • (46 stars)

    by Wanda A. DeSalvo on 28/07/2013

    I just used it to check my car speakers, worked great