Flips the polarity of every sample (multiplies by −1), either for the whole file or just one channel — the standard trick for fixing phase cancellation between two mics or two tracks.
The Audio Phase Inverter flips the polarity of a waveform — every sample is multiplied by −1. In isolation it sounds identical, but it matters when sounds are combined: an inverted copy added to the original cancels it completely, which is how nulls, karaoke tricks and phase-alignment of microphones work.
Inverting a single channel of a stereo file can fix a wrongly wired speaker or a microphone recorded out of phase, restoring bass and centre image.
Phase inversion multiplies every sample by −1, turning peaks into troughs. It is lossless and exactly reversible. Two identical signals of opposite polarity sum to silence; partially similar signals partially cancel, which is why out-of-phase stereo sounds thin and hollow in mono.
Fix two mics recording the same source out of phase.
Compare two files by inverting one and mixing.
Correct a reversed-polarity recording.
Create stereo cancellation effects.
| Operation | sample × −1 |
|---|---|
| Reversible | Yes |
Phase is a time offset; polarity inversion is a 180° flip that applies equally at all frequencies.
When two mics recording the same source (like a snare's top and bottom) cancel each other and sound thin, flipping the polarity of one restores the missing low end. It's also used to test whether two tracks are identical (inverted and summed, identical tracks cancel to silence).
Usually not — a polarity flip on its own is inaudible. It matters when the inverted signal is combined with another one.
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