Finally finished my install bk in July,,had a Professionally built Ported Box mde for these Monsters,8 cu./ft per sub,which the box does nt hve the center seperating the subs, and it has 1 massive square port tuned down to 30Hz ,,n all i can say is it moves everything! ,im powering 2 of these wit 2 5,000 watt mono amps tht are Strapped together,, and everybdy tht hears or sees these subs cant do anything but let their jaw hang open cuz they are strait up a beast,like i said in my post months ago i got thm in a pretty gud size van a 2000 Chevy Express High Top ,which i also am running 2 15inch Kicker Solo Baric L7's ,but these Crescendo 18's way outground the L7s ,barely cn tell the L7s are goin cuz these things are so extremly loud ,,but i wish they would allow us to put pics of our setups on here,id love to show others to maybe inspire ppl n it mite also help wit other ppl 2 figure out hw they can do theirs,,I GIVE THESE CRESCENDO CONTRALTO'S 5 STARS ALL THE WAY !!! WAAY WORTH THE $$ ,ME N MY WIFE ARE 110% SATISFIED

I jus bought 2 of these awesome monsters, and they came pretty quick,great company n will B buying from then again n again,haven't got them put in yet, just ordered 2 5,000 watt Planet Audio Mono amps to data link together to push these sexy bruisers,they are truly heavy 75lbs each,n getting a 8 cu/ft per side ported box made for them,can't wait,I've owned and seen n been around a bunch of different subwoofers and these by far have a magnet size unlike no other,they are beyond huge I couldn't believe my eyes,right now I'm running 2 12 inch Kicker Comp VR'S n a ported box n 2 15 inch Kicker Solo Baric L7's n a 4 cu/ft box,I'm giving my wife the 12's n putting these crazy huge 18's wit the 15's,after I remove the back seat in our 2000 Chevy Express High Top van, it already beats crazy hard but I know these will rule anything else around, n I've also upgraded my alternator frm the stock 110 amp to a 300 amp n dun the Big 3 upgrade, but if your looking for a sub that looks way better n built with true quality look no further,I'll post an update after I get them installed,, and all I can say is I'm truly satisfied wit them n the pictures of this sub doesn't do them justice, they're very very impressive in person, everybody who's seen mine drops their jaw

Just got the 18 to day and it is absolutely beautiful heavy as hell to almost done with the box and I'm soooooo ready to hear this monster bang