Do you have the measurements for the box you did I just need a rough estimateIts gonna depend on the woofers, if the box is sealed, ported or bandpass. It is all about airspace. You need to determine how many cubic feet of air is required for the woofers and the shape/style of the box. Not really a one size fits all thing. I fit 2 two 10" JLs on the "shelf" of my 1985 Cutlass in a sealed box with no issues leaving me tons of space for my other needs.
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