On Fri, 19 Oct 2007 23:28:57 -0400, "Arny Krueger"
wrote:

I don't think anyone is going to call the IMF a small box. But then I
suppose it isn't really a box at all.

The tech analysis of transmission line speakers I've seen say that its
simply a very wasteful way (in terms of volume versus bass extension versus
efficiency) to make a vented box. That may help explain the large size, all
other things considered.


No, not a vented box, but an infinite baffle. The idea is that the
entire back wave is absorbed in the line. Nothing comes out of the
vent, and nothing bounces back at the speaker.

There is a variant in which the line is not stuffed to criticality in
which vent power is used to prop up the low end, but that isn't
strictly a TLS. Forget what it is called right now.

d

--
Pearce Consulting
http://www.pearce.uk.com