Re: Soaking test results
>Also, a Decibel is not an absolute measurement of sound, i.e. 120 dB
>damages hearing, etc. This is a mistake, and should be dBm, or decibels
>referenced to one milliwatt of acoustic energy. Remember - dB is a RATIO
>(i.e. twice as loud - but as WHAT?). By anchoring it to a standard (dBm,
>or "twice as loud as 1 milliwatt"), we now have a way to express absolute
Very good discussion of decibels, a very potentially confusing subject.
ONe clarification: when dealing with acoustical measurements, especially
sound level meters, we are measureing a thing called Sound Pressure Level
(SPL), which is actually based on the ratio of two sound pressures, the
reference pressure being 0.0002 dyne/cm^2, about the threshold of hearing
for most folk. dBm is actually used more for electronics.
Sorry, I'm an acoustical consultant, can't resist...
Scott
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