So I plan on making a fiberglass box, but I keep hearing about bracing. So any info about bracing would be much appreciated. and since I'd probably be running two 10's, I should divide the box right? Well should I use fiberglass to do this too, or MDF

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91 bird - stock 305 tbi for now, auto, t-tops
-Panasonic CQ-DF600U head unit w/8 disc cd changer, JBL 6x9s, Pioneer 4x6s, Alpine V12 MRV-100M amp powering two 10 RockfordFosgates in a homemade sealed box, kind of a motley crew but works so far

 

(Look at the other post where you asked about this.)

I recommend that any large sub box use some kind of bracing. A divider is one form of a brace and, in some cases, may be enough.

I recommend using a divider because it will allow you to runs subs stereo (if you want), it will allow you to run only one sub at a time (if you need to), it will allow you to more easily diagnose a problem with one of the subs (if you have to), it acts a a nice brace (which is good), ect.

The divider should be just as strong as the walls of the box. You could make if from fiberglass, MDF, glass covered MDF, glass covered foam, ect.

If you're making a large box to fill the well area of a firebird then the contours in the shape (the little 'shelves' on the left/right sides) will help to strengthen the box. Make the fiberglass walls/bottom of the box more than 1/8" thick, build in a divider, and make the baffle at least 3/4" MDF .... then the box should be strong enough to handle anything 2 10s will throw at it.

 

One of the best braces you could do would be to build a divider with the entire middle removed...basically a frame that will traverse all the way around and fiberglass that right into the box (that is if you don't want fully divided box)...otherwise just fiberglass some cross braces between the two longest walls and you should be fine.

1/2"-3/4" MDF is fine for bracing, usually scrap pieces lying around are great for this.

Do whatever it takes to hold them in place and mold the fiberglass right over them to make it part of the box...that should get you set.

(sometimes I wonder if I make sense?)

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Carl
CarAudio Resources

 

I like the idea of two woofers sharing a single enclosure, but also need to watch, if one woofer goes, that you catch it quick. Because then the good woofer will see almost twice the airspace and over throw the suspension of the woofer.

But I would recommend making any enclosure out of MDF first, then if you want to do some custom molding, then add layers of cool fiberglass. But fiberglass alone will add some major vibrations in the car, and may flex if not thick enough.

Good luck, just throwing my thoughts in.