To install: tap the Share button, then “Add to Home Screen”.
Signal
Music file
No track loaded.
Level
Output
Protect your ears and gear. Start low and raise slowly. Pink and white noise are fatiguing — never test at loud levels on headphones you're wearing.
Levels are relative to your device's digital full scale. For line-level testing, set the device's own volume to a known position (often maximum) and leave it there.
Which signal?
Pink noise — equal energy per octave, sounds balanced to the ear. Best for speaker placement, room checks and SPL calibration.
White noise — equal energy per Hz, very bright. Good for spotting crackles, dropouts and hiss in cables.
1 kHz tone — steady sine for setting gain structure, checking meters and line levels.
Music — a real-world check, loudness-matched to the selected level.
Invert right — with Both selected on two speakers, the centre image should collapse and bass thin out. If it gets fuller, one speaker is wired out of phase.