How to use it
- Lower the volume first, then put on your headphones.
- Press Left and Right: each sound must come only from that side.
- Try the sweep, bass and phase tests for a deeper check.
Questions and answers
What if left and right are swapped?
Check that the headphones are on the right ears (L and R marks). If they are, the problem is in the cable, adapter or sound settings; look for a balance or swap-channels option in Windows or macOS.
What frequencies should I hear?
Young people hear roughly 20 Hz to 20 kHz; the upper limit drops with age, often to 14–16 kHz in adults. Small speakers usually cannot play very deep bass.
What does the phase test show?
In phase, the sound feels centered between your ears. Out of phase, it feels wide and hollow. If “In phase” sounds hollow too, one side is wired backwards.