"Capt. Cave Man" wrote:

Eeyore wrote:
Jim Thompson wrote:

(2) No double wall with sand fill ?:-)

No need. The best structural material for speaker cabinets is a
composite made of a plywood outer ( for durability ) with an MDF inner
for damping. 'Honeycombing' the interior ( probably with MDF panels )
will also reduce panel resonances and provide additional structural
strength.

As does a slathering with a foamy polyurethane material, as is the
habit with Polk and many other makers.

That would be another way. Various synthetic and non-synthetic materials
can be used to good effect to reduce driver cone rear radiation. Personally
I'm rather fond of the absorbent transmission line enclosure that simply
absorbs most of the rear radiation.

This form of design is currently probably best implemented by PMC (the
Professional Monitor Company ) who make designs for both studio and home
use. They sound lovely.
http://www.pmc-speakers.com/

I think the number of awards speaks for itself.


Graham