Beatzuckerv1.8.0
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STEREO LAB

Check stereo width and phase online.

Measure phase correlation, width, balance and mono loss locally.

Choose a stereo track

Analysis stays in your browser

READ THE MEASUREMENT · CHOOSE YOUR NEXT STEP

What do the stereo readings mean?

The analyzer measures the whole decoded file, not live playback. Averages can hide a brief problem in a chorus. It does not repair or export your audio. There is no mono playback switch here: use your DAW for that listening check.

Correlation, width and mono level — explained
  • Correlation: +1 means aligned channel content, near 0 means little correlation, −1 means opposing content. None is a universal quality target. Missing band energy is shown as —, not a pass.
  • Side/mid: 0× means no side content; 1× means equal side and mid energy. This is not a width percentage. When the mid signal disappears, the ratio is undefined.
  • Mono level compares (L + R) / 2 against stereo RMS. Identical channels give 0 dB; uncorrelated channels of equal energy give roughly −3 dB. That alone is not a phase fault or a LUFS measurement.
  • L/R balance shows average energy differences, not whether a voice is centred. A mono file has no independent stereo width information.
Understand stereo widthCompare a referenceCheck the mix as a whole
BEATZUCKER AUDIO LAB

Analyze stereo width, phase and mono compatibility

Measure left/right correlation, side-to-mid width, mono level change and balance, including separate low-, mid- and high-band phase correlation.

Sample-based vectorscope
Three frequency-dependent correlations
Fully local analysis
PRACTICAL EXAMPLE · ILLUSTRATIVE, NOT A TEST RESULT

The bass disappears on a mono speaker.

  1. Try this: Check low-band correlation and switch to mono in your DAW. Temporarily bypass bass and master-bus stereo wideners.
  2. How to interpret it: Negative correlation can indicate cancellation. What matters is whether important elements disappear in mono.

How it works

  1. Open a stereo track locally
  2. Calculate global and band correlation
  3. Verify risky values in mono and across systems

Frequently asked questions

What does negative correlation mean?

It indicates opposing-phase content that can become quieter or disappear when summed to mono.

Is a wide mix automatically problematic?

No. Important elements should remain stable and the mono sum should still work musically.

Why is low-end phase important?

Out-of-phase bass can lose substantial energy on mono playback systems.

Learn more about audio

Stereo width in masteringCommon home-recording mistakesPrepare a mix for mastering