Going to build a sub box.

The standard flat sided wood box will be a challenge do to the shape it has to be to fit where it will go.
I can make one from FG way easier to get the require volume I need, using the flexible foam coring to shape the irregular shape, then lay glass over the foam.

What's your thoughts on FG vs wood boxes as long as it's airtight.

I see tons of You Tube videos showing guys making custom car sub boxes and never a mention of sound vs wood box. The FG boxes appear to be nothing more than a layer of glass over fleece, then body filler to final shape. Can't imagine wall thickness being near the thickness of the wood boxes. The weight savings is also a major factor do to how I'll have to mount it. If FG, it can be self supporting.

My experience is you loose a little bit of the punch and clarity with the foam (not a ton). If you just want the boat to shake, don't worry about it. But if you really care about clarity and were going to put say a JBL W10/12/15 go with the most dense foam you can find or do get a jig saw out! don't forget to port the boxes!

JL 10 marine sub. No ports according to the web site.

FG works great for a sub box.
http://www.jlaudio.com/marine-audio-...woofer-systems

just needs to be thick enough not to flex particularly where the sub mounts. I installed two 10" JL's in my boat in the helm console under the front seat and wasn't impressed by the bass then I noticed that the woofer frames were moving instead of just the woofers themselves. I backed the fiberglass panel with a 1" of marine grade plywood and now they sound much better.

I've got fiberglass boxes that mount under my bolster seats for a pair of Boston Acoustic G5's. They work great, look great and I was able to keep all my storage space. As to your other question, Ginger!

Any pics of the boxes?
You are the 1st to vote for Ginger.

The foam is a sheet with a mesh backing to hold them in place, with the foam cut into 1x1" squares. I'll fill the gaps from the foam bends with resin/filler mixture, then lay 1 or 2 layers of glass over both inside and out.

Thanks

I'll see if I can find some pics, if not I'll go take some.

Your answer is yes..High density particle board is used primarily becasue it is cheap and dense and easy to use...dense meaning not subject to vibration..plz note even in small boxes internal bracing is used,

One could use 1/4" plywood to construct a box, it would have to braced on all corners and cross braced in expanses. Then laid up with biaxle tape say 3 layers both inside an out. much like a stringer.....that is the wood would only provide a form for the box to be made..the glassing would be the acutal structure.

Go visit a high end car audio installation facility and watch what they do...pretty amazing.

Remeber sub's look simple and are simple but they move a hell of lot of air..more than you might intially think....Not unlike a psiton actually pretty much the same...

http://www.tccustomz.com/custom_work

A friend of mine made a nice box with wood and fiberglass, he used mdf for the front plate where the speaker mounted to prevent flexing, then built a frame with wood dowels, stretched some fabric around the outside of the wood dowels, then fiberglass over the top of the fabric. Once the speaker hole was cut the wood dowels were removed so they did not come loose and bounce around behind the speaker. I am running into the same problem, I just got a Checkmate Convincor 270 and there is no space to mount speakers in the darn thing. Going to hide a couple sub boxes up in the cuddy the best I can then mount some speakers up under the side skirts, I do not want to cut holes in the boat.