26 / Device Tests
Speaker, Headphone & Left-Right Test
Test left, center, and right channels, sweep frequencies, play safe test tones and noise, check phase, and save a result.
The page caps its own output at 30%. Your operating-system, amplifier, headphones, or speaker volume still controls final loudness.
20 Hz–20 kHz
Frequency sweep
Listen for dropouts, buzzes, rattles, or a sudden channel imbalance. Human hearing and speaker response vary, especially at the extremes.
Isolate a band
Tone generator
Three spectra
Noise and balance
Each noise sample stops after 3 seconds. Pink noise is usually the easiest starting point for checking left/right balance by ear.
Stereo wiring
Phase check
In phase should sound centered and solid. Out of phase often sounds wider, hollow, or hard to locate. Headphone results can feel different from room speakers.
Local test receipt
What you ran
No audio has played yet.
Field note
How to test speakers and headphones safely
Start with page and system volume low. Check left, center, and right before a sweep. A missing channel can come from a loose cable, Bluetooth profile, operating-system balance setting, mono-audio accessibility setting, amplifier input, or the speaker itself.
Sweeps and single tones reveal obvious buzzes or dropouts, but perceived loudness naturally changes with hearing, room position, and the speaker's response. A browser cannot measure acoustic frequency response without a calibrated microphone.
In phase versus out of phase
Two room speakers wired in phase usually create a focused center image. Reversed polarity on one side can thin the bass and blur the center. Do not use the result as a hearing test; stop immediately if any sound feels uncomfortable.