From proto8@yahoo.com Tue Mar 26 16:08:18 2002
Subject:Re: hearing loss


--- Galen Reddin wrote:
>
> What decibel level is considered the limit of safe sound pressure
> level exposure?

Here are the OSHA (Occupational Safety Health Administration)
standards on maximum time exposure to sound pressure levels before
hearing damage occurs.

90 dB SPL @ 8 hours
95 dB SPL @ 4 hours
100 dB SPL @ 2 hours
105 dB SPL @ 1 hours
110 dB SPL @ 1/2 hour
115 dB at 15 minutes
120 dB SPL - avoid or damage may occur

Here's something else I found online:

Music levels vary from about 50 dB for quiet background music to
maybe 120 dB for a very loud rock band. Subjectively, a 2-3 dB change
in sound level is barely perceptible; if someone asks you to "turn up
the volume a little," you will probably increase the sound by at
least 3 dB. (Note that if you have a 100-Watt amplifier and it
doesn't play loud enough, you need a 200-Watt amplifier to turn up
the volume 3 dB. This can get very expensive very quickly). A full
orchestra can also hit a sound level of 110 dB and more, and then
play a quiet passage at 20-30 dB.

=====
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