[RichD]

A few days ago, I was in a room on the third floor, the
window was open, some people were conversating
down at street level. Their words came in, clear as a
bell, almost like being in the same room. I was surprised,
I thought the power would attenuate a lot faster.

Then I wondered if it also works the other way - could they
hear our conversations, just as crisp?

I recall a discussion of optics, and someone remarked:
'I see you, you see me' is pretty much a universal law.

Does that also hold for acoustics?

--
Rich