Subs arent Hitting very hard

Is your car a hatch back / suv?  If not, and the seat is fairly solid, you'll need to find some way to vent into the main cabin.  Also try playing with the position of the subwoofer.

Other consideration:  do you have low pass filters turned on?  gain set correctly?  how do you have them wired?

Two comments...

1)  Max power means nothing, only look at RMS2)  Need to give more information for anyone to help

New Project: 2003 Pathfinder

kfr's right. only thing i would add, is definitely check the LPF and the frequency ur amp is set at. its possible that u have it set too low, and ur not getting any bass notes due to the fact that you are using a bandpass box. bandpass = crap. fyi. 1990 Honda Civic HB:

Clarion DXZ545MP H.U.

2- 6.5" Power Acoustik interiors

Diamond Audio 600.1 amp

Diamond Audio 15" M6MKII

Pyramid PB881X 4 CH. Amp

might sound dumb but maybe you're not bridging the speakers?

You cant run that amp in two ohms. It will go smoky smoky. Those amps were netarious for drawing a ton of current without much pay off. That thing is mege inefficent. What you have is a bad match of subs and amp. You need to ditch that current drawing pig and get yourself an amp that is two ohm mono stable. Mabye like a JBL600.1 or a Rockford 3001 or 6001, or MTX 4001 or 6001, or an alpine or a JL or something to that effect. Thats gonna be the only way to really solve your problem and keep those subs. I love pioneer stuff and actually use it quite a bit but their amps have never been a shining point for that company.double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

I have a Bronco II so its an suv.  the subs wired seperatly off of the amplifier if that means anything.  I didnt do anythign to bridge them, so if that will help i will tyr that.  If i try putting them ina sealed enclosure will that help as well?  my amp has a switch for LPF and i have it turend to on and the gain control is set about 3/4 the way up.

DONT BRIDGE ON THAT AMP!!!!!!! It is not two ohm mono stable and thats what you are talking about doing. I CANT STRESS ENOUGH HOW MUCH YOU SHOULDNT DO THAT. Those amps have dependability issues at 4 ohms and actually had a dealer recall put out on them last year where all the remaining stock was recalled by pioneer due to a manufactures fault which caused them to be very unstable. If you put it in two ohm mono I would guess you have about an eighty percent chance of frying that bad boy. Get  a new amp for your subs and use that for your speakers or something.double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

alright ill try that, would putting the subs in a sealed enclosuser help tho?

no, its ot gonna really help you out. In fact it could make it quieter.double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

alright, what would be a good amp for this set of subs thats not gonna cost me an arm and a leg