Polarity Checker




    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:

    - 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 , phase checker software , speaker phase checker software , polarity checker speaker , speaker polarity tester , speaker polarity checker , phase checker tester for audio speaker , audio polarity checker

    Users review

    from 609 reviews



    Users comments for Polarity Checker

    Tahir Quresh

    by Tahir Quresh

    Nov 20, 2017  |  "Awesome"

    Good app

    Hubert Cumberdale

    by Hubert Cumberdale

    Nov 19, 2017  |  "Awesome"

    Snapped a speaker cable in my surround sound system. There was no indication of which wire was positive or negative on the wires themselves or going into the speaker. This app was great as it allowed me to make sure the speaker had the same polarity as all the others when I rewired it.



    Nov 15, 2017  |  "Awesome"

    Very useful tool. Works as expected most of the times. Overall gets the job done. However needs some improvement to become perfect.

    A Google user

    by A Google user

    Jul 04, 2017  |  "Great"

    Future more better ...!

    Paul Ganevich

    by Paul Ganevich

    Jun 18, 2017  |  "Poor"

    Garbage, doesn't even work, it shows green 2 times then red then green then red and keeps changing. Played with threshold control and tried all pulse generator tones as well as my own tones from focal same thing.

    Tim Draper

    by Tim Draper

    May 24, 2017  |  "Awesome"

    really easy with two devices. Tablet to generate the tone with headphone-to-rca cable, phone to sit next to the speaker. While i knew i was "phased-out" as it just didnt sound right, this app help me find that one of the 4 speakers was reversed. It didnt seem to work with subwoofer even with the 80hz test, but it did exactly what i needed on the full range speakers. It did mis-report every so often (background noise?), but with a vast majority coming back as either red or green it's easy to see the polarity.