Speaker Test
Left and right
Each button plays a short chime. You should hear it only from that side.
Start with a low volume, especially with headphones.
Frequency sweep
A tone that rises from 20 Hz to 20 kHz over 12 seconds. Buzzing or rattling points to a damaged speaker. Most adults stop hearing it somewhere between 14 and 17 kHz.
20 Hz
Tone generator
440 Hz