ear plugs

[Thomas D. Seay, III]

>US dept of Labor extract a.k.a. OSHA
>dBA Slow          Hours/day (max)
>90                  8
>92                  6
>95                  4
>100                 2
>102                 1 1/2
>105                 1
>110                 1/2
>115                 1/4
>
>Yamaha C3 in 8.5'x7' room (small, no?)
>Temp/octaves         88 - 90 dBA
>Unisons              96 -105 dBA
>Unisons              110 - 115 dBA (fast)
>
>Young Chang G-175 in same size room
>Temp/oct             89 - 93 dBA
>Unisons              98 - 106 dBA
>
>Steinway B - student playing Ravel = 98 dBA
>
>Yamaha C3 - student playing Beethoven = 96dBA
>
>2 cu.in chain saw - 14" bar  = 105 dBA idling//117dBA wide open/no load
>
>Friendly trumpet professor 121 dBA @ 4'  (nice friend...)
>
>Readings on pianos were taken from approximately ear position,
>at first...
>
>The S&S D's and SD-10's were equally loud to the ear distance, but as
>they are in large halls the attenuation was what you always were taught.
>The sound level decreased exponentially inversely with the distance.
>
>The practice rooms were a different matter.  I found that I got the same
>readings at the tuning pins, at ear placement, on bench beside me, on
>bench - meter turned away, and on floor as far away as I could place it.
>In fact, at one place on the floor I got _higher_ readings. -must have
>found an antinode.

Conrad,

Got any readings for two teenage boys slugging it out? According to the way
my two young'uns go after it, it's got to rate somewhere between jet engine
noise and a chainsaw.

Tom Seay
The Unversity of Texas at Austin

t.seay@mail.utexas.edu