Fiberglass box Single or Dual Chamber?

[ramfits]

I have a 2007 Silverado Ext Cab (new body). Im going to attempt and build a fiberglass box and fit 2 JL 10W3v3's. I have no idea how I would go about making two chambers with a fiberglass box. Will it be ok if I put both in the same box sharing the same air space? if so, each sub needs .625 cubic ft, would it be safe to assume that I can just make a single chamber box with 1.25 cubic ft? The mounting depth for these subs are too deep for me to make a 3/4 in mdf box. Thanks!

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