I recently just bought a Art Studio SLA-1 power amplifier (dual channel 100w) and im currently running two 12 inch subwoofers (bridged) with it... im finding that i dont have enough power to truly "push" the subwoofers. So my question is; should i upgrade my power amplifier or simply just buy a "powered sub"? if your wondering why im not using a powered subwoofer to begin with, its because i have over 10 different car stereo sub woofers (un-powered obviously) and that i thought i should just buy an AC power amp and ill be good to go... but unfortunately i need over 400 watts of power in order to truely "stress" my subs. any input on your dealing with this subject would be be greatly appreciated, thanks ps, this is my first post so.... hi everybody!!