# Feature request: Polarity Test
**URL:** https://forum.quantasylum.com/t/feature-request-polarity-test/2049
**Category:** Uncategorized
**Created:** [September 21, 2025, 10:20am UTC](https://forum.quantasylum.com/t/feature-request-polarity-test/2049 "2025-09-21T10:20:07Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@philipppaulklose](https://forum.quantasylum.com/u/philipppaulklose)
#### Post date: [September 21, 2025, 10:20am UTC](https://forum.quantasylum.com/t/feature-request-polarity-test/2049/1 "2025-09-21T10:20:07Z")
I could really use a continous running (automated) test that gives me a green positive or red negative, depending on the polarity relation of input to output. Is this on the to-do list?
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### Author:  [@peppermint](https://forum.quantasylum.com/u/peppermint)
#### Post date: [September 24, 2025, 6:43am UTC](https://forum.quantasylum.com/t/feature-request-polarity-test/2049/2 "2025-09-24T06:43:49Z")
This is an excellent idea!
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### Author:  [@matt](https://forum.quantasylum.com/u/matt)
#### Post date: [September 24, 2025, 2:05pm UTC](https://forum.quantasylum.com/t/feature-request-polarity-test/2049/3 "2025-09-24T14:05:49Z")
Hi @philipppaulklose, the QA401 had a measurement tile that indicated degrees (at the current frequency), and also a mic-test plug-in that would give a go/nogo test on polarity. I will look at getting something resurrected. The measurement tile would look at phase difference between output and input.
For an automated test, you can use the AMP frequency Response Chirp and take a look at the plotted phase.
Do you think a measurement tile that works in single-tone mode that displays phase degrees (output versus input) at the current frequency would be helpful? This will get confused if the amp has any DSP. In those cases, the AMP Frequency Response Chirp with right channel as reference will be needed.
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### Author:  [@philipppaulklose](https://forum.quantasylum.com/u/philipppaulklose)
#### Post date: [September 24, 2025, 2:54pm UTC](https://forum.quantasylum.com/t/feature-request-polarity-test/2049/4 "2025-09-24T14:54:28Z")
Thanks so much for considering this! QA401 is before my time 😉
Polarity testing is always to be taken with a grain of salt especially when DSP is involved and in small acoustic environments. A measurement is always an accompanying thing to do.
I like NTI‘s approach on polarity testing. They use a looped impulse and split the received signal into several bands (I think it is five or seven bands) and then show the results (pos, neg) per each band.
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### Author:  [@tkuzma](https://forum.quantasylum.com/u/tkuzma)
#### Post date: [September 24, 2025, 5:13pm UTC](https://forum.quantasylum.com/t/feature-request-polarity-test/2049/5 "2025-09-24T17:13:51Z")
I made a phase test for Tractor a few months ago if you want to check it out. There’s one for the QA401 and one for the QA403. I think I made one that just does 180 polarity checks against a reference before and after you manually flip the polarity. I’ll have to dig it up if you’re interested in that one as well.
Cheers.
Tom
> [@Tractor Phase Measurement Test](https://forum.quantasylum.com/t/tractor-phase-measurement-test/1659):
>
> Hey all, I’ve seen this topic come up before and I’ve run into several situations in production testing where I needed to measure the phase of of the DUT. Tractor never had this test, so I made my own. You can select the reference channel to be the QA401 output, or the Input of the opposite channel. When using the output as reference, the measurement is just the same as what is shown in the QA401 software. The test is in the “O…
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### Author:  [@restorer-john](https://forum.quantasylum.com/u/restorer-john)
#### Post date: [September 25, 2025, 11:53pm UTC](https://forum.quantasylum.com/t/feature-request-polarity-test/2049/6 "2025-09-25T23:53:12Z")
The easiest way IMO is an asymmetrically clipped sine, viewed in the time domain. (scope). Or run a series of impulses (one polarity) and view. Doesn’t matter if there’s delays or DSP then.