https://www.szynalski.com/tone-generator/

10대 초반 : 19khz

10대 후반 : 18khz

20대: 17khz

30대: 15khz

40대: 14khz

❌You can damage your hearing or your speakers if you play tones at extreme volumes.

 People can’t hear sounds < 20 Hz and > 10,000 Hz very well. If you turn up the volume on your device to compensate, you could expose yourself to harmful sound levels and your speakers to harmful currents. To be safe, note the volume level that allows you to listen to a 1,000 Hz tone without discomfort and do not stray too far above this level, even if you can’t hear much – especially in the high range, where your hearing is the most fragile.