Why loud jazz is bad.
See
http://www.time.com/time/health/article/0,8599,1881130,00.html
More detail at:
http://www.noisehelp.com/ipod-hearing-loss.html
| Volume Level | Maximum Listening Time per Day |
|---|---|
| 50% or below | No limit |
| 60% | 18 hours |
| 70% | 4.6 hours |
| 80% | 1.2 hours |
| 90% | 18 minutes |
| 100% | 5 minutes |
add 10% to vol. level for headphones
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