On Thu, 25 Dec 2003 13:32:47 +0100, Peter Larsen
wrote:

Stewart Pinkerton wrote:

You do raise an interesting point, however, as I'm having trouble
running the numbers as tpo how small the hole in the ceiling can be
before it causes problems with either port noise or turning the
manifold into a reflex cabinet. Any advice on that mattter from your
own experience?

Nobody seem to worry about air distortion in spite of using 4:1 or
higher (guesstimated) compression in loading the room, including
distortion due to the asymmetric airload experienced by the drivers (box
with 5 (?) ceiling mounted drivers and small room entry seen on some
site linked to).

Could you give me a pointer to such a site? It's the idea of a *big*
hole in the ceiling that is caused WAF problems.
--

Stewart Pinkerton | Music is Art - Audio is Engineering