ordered this sub on sunday and got it on friday put it in a 1.8 cf ported cab and hooked it to a fosgate p500-2 which says it puts out 800 bridged at 4 ohms. this sub replaced a p3 fosgate 12 in a sealed box. really great sq and lots of volume. not broken in yet but still very tight sounding in vented box. all and all very happy with the whole deal. great sub, great price, and great service. o yea i put it in a 2000 xterra with fosgate t400-4 on highs 6x9 in back and 6.5 components in front. sony deck and crossfire preamp. really sounds nice and clear and punchy not real loud but enough for me Im 40 years old and listen to old guy music(dead, phish, jazz, and some death cab, and some old maiden, and rush ya know. the alpine sub sounds great and for 139.00 delivered you cant beat it. and by the way there was nothing wrong with the p3 sub just wanted to put something in the nice ported box i had laying around. both subs kick ass in my opinion. cant go wrong with fosgate or alpine. had kicker before in same boxes and to me kicker has loud bass but is very muddy sounding not clean and punchy like alpine,fosgate.