owhh you're talking SUB woofers... well even then I'd still do it anyway. I didn't realize all this flat pack talk was about sub woofer cabinets. I opened up one of Brian Ding's sub and was MIGHTY impressed at the bracing inside the thing. Bill Fitzmaurice's folded horn subs are quite genius in their internal design/bracing and as such only use 1/2" and it's a non issue. For what subs are this flatpacks for?
Concrete or cultured marble/granite counter-top is where it's at if your really worried about it.
or BAMBOO!!! IMHO the greatest material to build cabinets outta right now!Teragren Bamboo Countertop/Butcher's Block
Another AMAZING high tech solution is... SEAgel.
It's a type of aerogel. As a technology in terms of say... amp weight and the advent of ten pound digital wonders aerogel will revolutionize speaker cabinets in 10-20 years.
It's acoustics properties are incredible in that SEAgel and other aerogels. Imagine how light a loudspeaker you could come up with if you had a composite outer speaker shell with that SEAgel sandwiched in-between.
I've been watching it for some years and waiting for it to get cheap when they start using it in supertankers and highspeed trains for dampening. I believe that time has come!
Another problem is that is shatters and breaks but due to it's high compression strength you could come up with some kinda injection mold after it's blown into a shell of some kind. Shell, SEAgel then uhh... something under high pressure that would create inner shell but be acoustically and structurally sound. Absorption coefficients will be unlike anything we've ever seen!
I love reading about anomalous material research it's so so interesting especially the nano tech revolution going on!
Even as dampening material it ROCKS let alone using it for the actual cabinet structure.http://www.acoustiblok.com/
<-- their use of Aerogel is in an insulation strip product for steel framed homes. It's that stuff from the video below. It's seagel/aerogel mixed with polyester fiber. I can only imagine mixing it with other materials and what you could come up with. Perhaps cone material? owhh yeah that's been done!