system not as loud as it should be

hi,

first let me tell you what i have in my 2002 alero.

2 10" memphis power reference svc subs (new)

1 memphis 500d (used)

factory stereo (monsoon system)

8 awg amp kit

dual 10" sub enclosure with 3/4 mdf, and .80cf of air space on each side

stinger line output converter

now about the sound.  the subs are hitting, but just not as loud as it should be, i have the wired bass knob, and it is set at max. i have tuned the amp, i just don't know what else to do?

i have installed systems with a single memphis pr sub and the 250d that sound better.

any input is appreciated. 

Sounds like you don’t have the Xover on the amp set correctly. You have a subsonic filter set it as low as it will go. If I can remember its 20 HZ then set the low pass @ 80 HZ or a little higher and let me know what it sounds like.

how do the subs become wired out of phase? they sound like they are in phase.  but what do you mean about the converter being properly set, there are no gain controls on it.

what are the wiring codes for the rear speakers.  the wiring codes on this site are for up to 2000 alero's

the subsonic filter thing didn't really help, it increased the bass a little but not that much, and also there is a crackling sound from some kind of interfearance playing through the subs,  the subs also play whenever i use the keyless entry or pop the trunk. i installed the line output converter at the factory amp using the wiring codes given on this site. thanks 

What I mean by phase is make sure that the postive output from the amp goes to the positve input on both subs, and the negative is going to the negatvie side of the subs. Get a 9vlt battery and attach a red wire to the + side of, a black wire to the - side and then put the red wire one of the speakers wires and the black to other and look if the speaker goes in or out. Then go to the other sub and hook it up the same exact way and make sure the sub moves the same way.

i got the loudness problem fixed.  i just took everything out, and re installed it, man it slams, i mad my neighbors mad.

the speaker wires and power wire are only close together at the amp, because they both connect next to each other.

thanks for the help.