Do you wnat a proper system or just the 6X 9's? them minstry of sound ones will probably be shite imo 350 watt will be their maxx output and most likely they will have a 40 w rms. rms is basically the true power of the speakers. bare in mind i dont know too much, but i reckon i know enough. Also if you want to power your speakers i would suggest an amp, as the head unit acts as an amp, but a very small one that cant control too much. Now im pretty sure an amp in guitar terms is pretty much similar to a sub in car terms . . . im going to be running a pair of vibe qb 69's. inthe back a vibe 12"pulse intergrated sub and amp vibe fli door speakers. im still on the look out to find a decent 600w 4 channel amp to power the door speakers and 6X9's too.