Tim Williams wrote:

"Telamon" wrote in message
...
My point was that some otherwise ambiguous dB scales (at least one) have
a
defined absolute basis.

Like Michael stated dB is a logarithmic reference-less ratio value.

So what is acoustic dB?
http://home.new.rr.com/trumpetb/audio/dBexamp.html
SPL, I should say.

There it lies, x dB on the left scale.


That is a SPL chart with the dB levels referenced to 0 dB SPL =
0.0002 µbar.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida