Quoted: though it plays a part, the dimensions of the box are not that big of a deal. The only think to consider is smaller boxes should be sealed, and larger boxes should be ported. you should also seal the two speakers off from eachother, regardless if the box is ported or not.
adjust the box size to the area you want to install it in. the manual for the speakers should give you an idea what kind of cubic inches you want for the size of the box.
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What the fuck did you just say??
First off, the box is the MOST important part of the subwoofer system. More important then the type of sub, more important then the amp. You can make a crappy sub sound good or make an excellent sub sound like trash all based on how good of a box you built.
Also, there is no hard and fast rule as to large ported or small sealed. Its all what you want to accomplish. Small ported and large sealed boxes do exist, they have there purposes.
Also, it doesnt matter if the subs are sealed from each other or not. It makes no difference, in fact in a passive radiator system you have to have all subs share the same space.
Having said that, I'd suggest one of two things. First is follow the manufacturers directions. They generally have some box specs in the info that came with the speaker. You could follow that and have a decent box.
Second, if you want to get all out download WinISD Pro (Google it, its by Linear Team) and model your exact box using the speakers you have. This will tell you exactly what your getting. Sealed boxes are easy. ported boxes, try to keep your tuning point above the F3 of your sub and make sure you check for port velocity and keep it under roughly 60 ft per second, although you can go up to around 100 or more if you design a flared port.