k i am looking for some really good spl subs ive heard awesome things about these subse they look awesome and ive heard they can handle some power, i am about to order 2 fi btl 18" with all the options basically the works, how much airspace should i give these subs for spl and about whats the max power for these subs

k i am looking for some really good spl subs ive heard awesome things about these subse they look awesome and ive heard they can handle some power, i am about to order 2 fi btl 18" with all the options basically the works, how much airspace should i give these subs for spl and about whats the max power for these subs

Well all i can tell u is that these are the best subs ive heard yet i have fully loaded 18 btl's and they slam in my expedition , i am using 1 inch mdf at 10 cubes after all the displacements with aeroports at 33 hz which is bare minimum for a box and these things move some air i am running about 4000 watts to both with no problems..

Thanks to BRIAN (bk l) Nick and Scott for all there help ..... Definitely a must have sub. I have beat out alot of friends with these , especially when they run out of the truck lol

FI for life

^^ BTL 15's would probably outperform your 18's FYI

^^ BTL 15's would probably outperform your 18's FYI

Im assuming you mean in the same box right? If so, sounds about right from what i hear.