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.