deh-p80 pioneer deck. jl 1000/1 amp with two 15" memphis M1's in a slot box. its in a 99 grand prix se and the seats dont fold down but it slams. i know its not the loudest but for being 15's it sounds clean as hell. anyways i just got it and im thinking of upgrading subs. i was told 1 12" w7 would be louder and cleaner let me know what you think. thanks