[RichD]

On Apr 21, AES wrote:
I was once shown, some years ago, an "acoustic laser"
Two large (half-meter diameter) curved metal mirrors (like
shallow woks), spaced maybe two meters apart on an optical
table to form an acoustic resonator. *In the middle a chunk of
"acoustic laser material" consisting of a little
match-box sized box with an omnidirectional microphone at
each end, with each of these connected through a tiny
transistor audio amp to a small speaker on the opposite end.

Took up a lot of table space -- but "lased" nicely.

Sounds nifty, but I'm unclear on the concept of
acoustic laser - what is the definition, what
did you observe?

--
Rich