Hello iam very new to the car audio thing so any help would be good. my specs are pioneer DEH p8250 head unit Pioneer GM X544 Amp 4 chan 50w rms x 4 or 120w rms x 2 Pioneer TS-E1690 180w rms 16 cm 3 way x2 Pioneer TS-C1620 150w rms splits with tweeters and crossovers i had all this working and it sounded great. now i got to cheap subs and want to put then in. i disconected every thing and wired up the subs and got hardly any sound and F@#$ all bass. can any one help. many thanks in advance.