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Originally Posted by Sam Kapasi The shape of the box really makes no difference as long as you get the port right and the volume....I wont complicate you firther on that, though I fear Navin might  |
you forgot to include the volume of the woofer in your calculations. and in case of the ported box the volume of the port too.
so actaully you have to build a sealed box that is 1.5cu. ft. + a bit more to compensate for the volume of the woofer.
Sam, i believe you asked for this information.
Now that we have the volume done I am working on a new box idea. B&T and GTO have seen the first layout of this (the day of the JBL store opening at Attira). It involves using 6mm marine grade ply encased in resin bonded fiberglass. total wall thickness will be 12mm but it should be as stiff as if not stiffer than 25mm MDF. The other advantage of this technique is that you can build boxes to any shape rather easily.
6mm ply (not MDF) bends quite well (you can use 4mm ply if you need tighter bends). now use this as your "mould". encasing in resin bonded fiberglass makes it awfully
stiff and light. In the end if you still have resonances to damp use a mix of 1.5mm lead sheet, glass wool, and open cell foam depending on the nature of the resonances.