Date: May 05, 2001 at 10:43:28 From:Isaac, [100.a.006.syd.iprimus.net.au] Subject: Re: Maybe it would roll around the room?
"A sphere is the worst possible shape for a speaker enclosure because of its internal standing waves."
Just an elaboration: a sphere has the least amount of effect on the overall sound because it has the best diffraction loss characteristics. Internal standing waves can be minimized using box stuffing+lining (most, if not all, enclosures use stuffing anyway).
Here's a link about diffraction loss.
http://www.trueaudio.com/st_diff1.htm
BUT for low frequencies, yes, any enclosure shape can be used.