Man my boy had two jlw7 12's hooked to two old school rockford amps in a sealed box with some caps, that shit was foe to much. He got a lincoln ls 01 or 02, that shit slumps too much for me and I love car systems. He went to a stereo comp and got first hittin 148 db, my other boy went to the same comp and he had two solo barac L7 12's(dont remember the amps) in a malibu 97 or 98 and he was hittin 147 db.