subs for durango

I'm sorry, I meant to say could I reduce the size of the box even more it I use Polyfill?

Yeah, ive got 3 girls and a boy on the way, I need my seats to Murphy.

No, I would not try to make a smaller box by adding poly fill.  It affects the enclosure in a very small way and the .5 quoted is a absolute minimum box size.  Be sure to subtract the displacement of the woofer when you build the box.  So if the woofer displaces .20 cu ft. then you box would have to be .70 cu ft. to meet your min. requirement.

PA is not known for being a great brand name, but you could do worse.  Id bet you were attracted by the low price for the features they give.  High power handling, small box size.  I would bet that .5 is just a selling point, put on there to compete with the big boys.  I have never heard a FUBR (that i recall) but I have heard other PA stuff and it was all a bit overrated.  Then again it was all cheap so I suppose there is value in there somewhere.

Infinity makes a tight small box sub, the Infinity Kappa Perfect VQ, they had some on sound domain for 150 the other day ( .3 cu ft. min!).  When you go smaller your bass suffers, to compensate I would look into a 12".  I use tens in all my vehicles, but they are all ported.

It was on a "imperfect" 10" and 12" models, I don’t see them anymore.  They had a slight sticker misplacement on the back.  More like a wrinkle in the sticker.  Never the less, nothing that would hinder playback and they all came with a factory warranty.  WooT!