weak subs

im not asking for comments on my equiptment (cuz i know its cheap but its ok) just advice. Im running a lanzar "heritage" 600watt 2ch amp (4 gauge) with two 12" RF Punch Z's in my 94 cutlass supreme. The thing i notice is if i mess with the balance, one single speaker playin (all right or left) is about twice as loud as both playing (centered). So basically im guessing the amp just isnt pushing enuff watts for two speakers, i was just wondering what all of yous think?

you may have your subs wired out of phase. Try swapping the + and - on just one of the speakers

Same thing PaulD Said...And by the way Lanzar is quality and the Fosgates those are some really hard hitters. If your driving it right.

They are hard hitters, I agree, the vibe amps are pretty decent. Fosgates have some low end crap though too. Fosgates are more SPL subs too