I am soon going to be building what I *hope* will be the last subs I ever build. To this end, I want to make the enclosures as stiff as possible, since below 100hz stiffness is the most important characteristic of an enclosure. I am currently planning on using 1" plywood, braced extensively. Weight is a bigger constraint for me than volume, these are ~2 cu. ft enclosures, and I have a fair bit of breathing room (max external dimensions are 23x18x16"). I came across this article in searchign for ultrastiff materials to build from or reinforce with, and am curious as to whether folks here agree with the conclusions about rigidity. I know CLD techniques improve damping a great deal, but I have not heard these arguments re: the resulting rigidity before.
http://boatdesign.net/articles/foam-core/
http://boatdesign.net/articles/foam-core/
