On Sat, 12 Jan 2008 11:27:22 -0800, David L. Martel wrote
(in article <13oi55345gbl997@[EMAIL PROTECTED]
>):
> mr. b.,
>
> Thanks for the picture. From what I see all of the screw holes have
> screws and the 2 woofers match. That's not the case with the ones
offered on
> e-bay. You may wish to pass these by.
> Weird that the ****ts are blocked with insulation. Do you know why
that
> is?
>
> Dave M
>
>
That's the "aperiodic" part of the design. The idea is that the ****t is
"mass
loaded" That means that at higher frequencies it offers little resistance
to
air moving in and out of the ****t, but at the ****t's resonant peak and
below
it acts more and more like a plug in the ****t. This supposedly smoothes
out
the ****t resonance and gives tighter, cleaner bass.
OIW, as the frequency drops, the speaker acts more and more like an
acoustic
suspension speaker and less and less like a bass reflex.
I have heard critics of this approach say that it doesn't really work, but
I
don't know.
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