Subs and Amp for a car?

Sub and amp help car audio i.c.e bad sound quality from subs?

• ok i have a eq pionner front out back out sub out the ft bk go into a hifonics zeus amp mids only sub goes in to my d5000 amp then chains from the out into my other d5000 amp amp 1 are on master amp 2 on slave and turned all gains down i had a large box made with vent slot at bottom at 33hrtz ish and fitted the subs i then wired the subs in (hcca 15.2) box is open i bridged the sub duel coil to them selfs so out it is 2 wires -+ on each sub for each amp wired to amps and and played ok not what i thought low sound not low mening hrtz low volume bit crap so i messed with crossover on amp and put in more screws and braced the box and got a cd done bass test better but seems still low the speakers move well not to much just good i did thing one was out with the other ? would that do it also it the box any good and whys the out of phaze wires are all +- ?? any help is eq crap ???? HELP

• Answer:

  If your speakers are moving alot (like when you look at them your thinking to yourself, these should be thumpin!) they are out of phase. all you have to do is change your positive and negative on one of them and see what happens, it'll either get better or worse. (if they are out of phase and you correct it, it is a VERY noticable difference in volume) that's a really easy thing to try out, so do that first, and get that option eleminated.