New Subs, Amp, and wiring HELP PLZ!!

[pjvoc 10+ year member]

hey guys, I recently upgraded my current system from 2 alphasonik subs (400watts max)

and a q reference amp (460watts max), to 2 acoustic audio 12" subs (400watts rms each) and a cuspid extreme (1600watts max). I have built a box, its not perfect but it has everything but carpet. I have a 1600w amp kit with 4 gague wire, wired to my amp. Everything should work fine, but my subs sound horrible! If i turn my deck past 15 its not loud and it just is distorted to the highest degree! It really sounds like S***! I was wondering if theres anything im doing wrong... I know the items I have are very low quality, but the stuff I had before was even lower! and it sounded better than it does now, any help would be appreciated!

P.s I was also wondering if this problem might be comming from an incorrect bridging of my 4 channel AMP?? it just struck me that it might be the problem plz give me some feedback!

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[arsonbob 10+ year member]

Check the gains on the amp and make sure they are turned all the way up... don't use the bass boost either if it has one... Bad RCA cables maybe?

 

[pjvoc 10+ year member]

are gains input levels? Because my amp only has left input and right input levels...also, when I plug my RCA cables into one side, the other sub doesnt play, I have to plug the red into the right side and the white into the left because there is 4 jacks, and i only have 2 RCA cables, could this also be from a wrong bridging?