Stereo & Polarity Test

Verify your stereo setup is correctly wired and in phase. This tool tests channel separation, stereo imaging, and speaker polarity — essential checks for any audio setup. Use this tool to {check your headphones} and ensure both channels are producing equal, accurate sound.

Quiet Loud

Channel Isolation Test

Plays audio to one channel at a time. You should only hear sound from the indicated side.

Choose a channel to test.

Stereo Pan Sweep

Sweeps audio continuously from left to right to verify smooth stereo imaging.

Press Start Pan Sweep to begin.
L Center R

Polarity / Phase Test

Plays the same tone on both channels simultaneously. If your speakers are out of phase, the sound will seem to disappear or come from a strange location.

Choose a test mode below.
In-phase: Sound should appear centered in front of you.
Out-of-phase: Sound may seem to disappear or thin out if speakers are close together.

Why Stereo and Polarity Testing Matters

Correct stereo wiring and phase alignment are fundamental to accurate sound reproduction. Even a single reversed speaker wire will cause comb filtering that drains bass and muddies the soundstage. Generate focus, relaxation, or sleep-inducing frequencies with the free binaural beats generator.

Reversed speaker polarity reduces bass output and collapses the stereo image toward the centre — a subtle issue often mistaken for poor speaker quality or a recording problem. The noise generator produces three noise colours with different spectral profiles for different listening needs.

Channel Separation
  • Sound from only the left channel should come from the left
  • Crossover means cables may be swapped or wiring is incorrect
  • Critical for gaming positional audio and studio monitoring
Phase / Polarity
  • Out-of-phase speakers cancel bass frequencies
  • Stereo imaging collapses when channels are inverted
  • Common cause of thin, weak sound from a stereo pair