I have been looking into the FI BL with the cooling option for a while now and was wondering which IA sub would compare to it?

I'd say the Death Row series.

What are you looking for in a woofer?

i had a 15" bl

then i bought an 18" death row and they sounded completely different.

18" against a 15" ofcourse it sounds different

i had a 15" bl

then i bought an 18" death row and they sounded completely different.

Boxes were different right? Then of course they would.

well yea more cone area but the sub had a completely different sound.

the bl is based more on spl and the death row is more towards sq.

i felt that the death row was more precise than the bl.

and my buddy had an 18" bl and to me the death row was better all around.

Possibly the new Zv.2 from Sundown or the DR from IA.

18" against a 15" ofcourse it sounds different

No, not true.

warden!! ;] well in all seriousness the deathrow is similar...it handles 1000 watts. See how much room you are willing to give up and see which one can fit better it to a box of that size. You will be extremely happy with both, possibly more with the IA because...im just biased