Offset parabolic reflector w virtual point source behind enclosure???

[kenpeter]

http://www.zapaudio.com/distribution...EODOCSHORT.pdf

I had never heard of such a thing before.... Just thought it was an interesting read.

EDIT: Or maybe I had heard of them, just never before in an audio application?
I think my father had once mentioned the telephone companies using horns like this
for point to point microwave links??? But focused into a tight beam, rather than used
to cover a defined sector like the PDF above... Wish he was still around to ask.

OOps.. Hyperbola reflector rather than Parabola... Maybe thats the difference
between focusing a beam and covering a sector? I don't know the mathematical
difference between those curves, only that they aren't the same.

[Bill F.]

Very interesting. Reminds me of the ALT (Acoustic Lens Technology) from Sausalito Audio that they license to Bang & Olufsen, used in the Beolab 10, 9, 7-4, 5 and 3. In this case, the goal is constant 180-deg. horizontal coverage.

Here's the white paper.