Mono Compatibility Checker
Drop a track to see its phase-correlation meter, catch out-of-phase bass, and A/B stereo vs mono so you actually hear the low end drop. Measured in your browser — nothing is uploaded.
Does my mix work in mono?
A huge share of real-world listening is mono: phone speakers, most Bluetooth boxes, laptop speakers, club and festival subwoofers, and plenty of smart speakers all collapse left and right into a single sum. When that happens, anything out of phase between the two channels partly cancels itself out. The usual victim is the low end — a bass or kick that was widened, hard-panned, or pushed through a stereo enhancer suddenly gets thin or vanishes the moment the two sides are added together. A phase-correlation meter is the fastest way to see this coming: values near +1 mean the channels agree and survive the mono sum, values near 0 mean you'll lose energy, and negative values mean active cancellation.
This checker measures overall correlation and, more importantly, the correlation of the low band below ~150 Hz, where mono problems do the most damage. It also flags how much of the track spends time out of phase. Then it lets you hear it: hit Mono and the player sums left and right in real time so you can compare against Stereo and judge how much low end you'd lose. If the meter reads low or the bass drops audibly, the fix is to keep the low end centered and in phase — which is exactly what TrackGleam's master does for you automatically.
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FAQ
What is a good phase correlation value?
For the full mix aim for roughly +0.5 to +1. The low end below about 150 Hz should sit close to +1 — bass and kick belong centered and in phase. Correlation dipping below 0, especially in the bass, means those elements cancel and thin out on mono speakers.
Why does my bass disappear on phone speakers?
Phone speakers, Bluetooth boxes and club subs play a mono sum of L+R. If your low end is out of phase between channels — often from wideners, mid/side moves or a panned bass — the two sides partly cancel when summed and the bass drops out. Keep bass mono and in phase to fix it.
Does this upload my file?
No. Your audio is decoded, measured and played back entirely inside your browser with the Web Audio API. It never leaves your device.