I'm just wondering if using fiberglass sandwich panels would work with a sub box... (fiberglass, foam, fiberglass)... because this would give the box the rigidity but not the weight of mdf... anyone see any other pros/cons of this. I know how to make the panels, and have the skills to do it, but i don't want to waste my time and find out that its going to sound like crap. anyone know if its been tryed and how it sounded?

why not just fiberglass?

Fiberglass isn't very stong on flat surfaces. Unless this is for a custom enclosure (i.e. wheelwell, spare tire well...) I wouldn't recommend it...

i've used honeycomb carbon fibre.unfortunately the angles inside to box caused cancellation above 44 hz..it made absurd air movement @ 42-43hz though(i could slip my hand between the body of the car & the hatch).the box is on this thread in the iasca finals pics [img]graemlins/headbang.gif[/img]
stick to a rectangular box and give'er '$hit! :cool:

mmartin1872 - yes it will work just fine. I first suggested his to the readership of TermPro back in 1997 and a few experimented with it with good results.

Fibreglass resin eats some types of foam so test first before hand.

so the density of the sandwich panel wouldn't have an adverse effect to the final sound of the subs? i was always under the impression that the mdf was good because it was rigid and dense... am i wrong about this? sorry for asking all the questions guys

The composite enclosure would be plenty rigid but the box itself would ahve a higher resonant freq than an mdf one (due to mass). Foam is pretty lossy though so I doubt it would be an issue.