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Yes there are, they're called resistivly damped enclosures.
Or sometimes wrongly called "aperiodic"
This is an installation where the woofer is mounted in a baffle
(board) that completely isolates it's front wave from it's rear wave
and has a permiable membrane installed either over the cone or right
behind the motor structure.
In this application, the membrane acts as the enclosure by effectively
controlling cone movement.
I did this in my 85 4000 quattro (we all know where the gas tank is)
and am having wonderful results. BTW, it helps to start with
components chosen for their real world performance rather than a
mediocre manufacturer's advertising hype.
By this I mean pick up an issue of Car Audio or better yet,...
Auto Sound and Security and take a good look at all of the ads and
decide for yourself what type of b.s. most of the mass producers are
feeding the general public.
p.s. I'm not out to p*** anybody off, but I've spent the last 11 yrs.
of my life dedicated to the design and installation of esoteric car
audio systems and I am really tired of the general public's
misconception of audio and the mis-informed opinions that are
continually being used to fuel arguments that will never have a real
place in the ..........
uh o, Im rambling,
Look, it's really all only about the enjoyment
p.s. I'm sorry about the run-on.
______________________________ Reply Separator _________________________________
Subject: RE: Mega-Stereos
Author: Greg Koehler (Volt Computer) <firstname.lastname@example.org> at Internet
Date: 12/12/95 03:08 PM
In defense of John, I think Audis need more than an average dose of
bass to provide good balanced sound under normal driving conditions.
I've never been to one of those car stereo shows, but I doubt the
judges actually drive the cars around. At least with my model 80,
there's a substantial amount of road noise to overcome. Low-end noise
is even more pronounced if you opt for snow tires during the winter.
I have 110watts dedicated to a Bazooka tube firing through the rear
seats, and it provides sufficient, but not exemplary bass. When I
installed the system, I couldn't think of any other solution that would
still retain my miniature trunk -- What's the point of a Quattro if
you can't use the ski bag and don't have enough room to carry your boots?
Are there any other bass solutions out there which maximize trunk space?