Stereo Width & Mono Compatibility Checker

Knowledge Base

How to Read the Correlation Meter

The line graph shows phase correlation over the length of your file, from -1 (fully out of phase, will cancel in mono) through 0 (decorrelated, typical of wide reverb/stereo effects) to +1 (fully in phase, completely mono-safe). Most healthy mixes trend positive throughout, dipping only briefly and mildly negative on wide stereo moments like reverb tails.

What Counts as a Problem

Sustained correlation below about -0.3, especially on low frequencies or your most important elements (lead vocal, bass, kick), is worth investigating. It means real, audible cancellation is likely when this file is played back in mono. Brief, shallow dips on airy stereo effects are normal and not usually worth chasing.

Using the A/B Player

Switch to "Mono Fold-Down" and listen specifically for anything that thins out, gets quieter, or disappears compared to the stereo version. This is exactly what a phone speaker or smart speaker will do to your mix, so hearing it yourself here is the most direct way to judge whether it's actually a problem in practice.

FAQ

Q: My file shows negative correlation but sounds fine in mono, is that a problem?
A: Not necessarily, some deliberately wide effects (reverb tails, certain synths) naturally read negative on the meter without causing an audible problem when actually summed to mono. Trust your ears on the A/B player alongside the meter reading.

Q: Does this work on mono files?
A: A true mono file will show perfect +1 correlation by definition (identical signal on both channels). This tool is most useful for genuinely stereo material.