I have one ten and it hits pretty hard I really like the extra trunk space too. It won't shake the neighborhood but it sounds great with the components. I took out the back speakers and made a big improvment cause they were playing louder than the components!! You could hook up all four to one amp than put a resistor on the rears to bring the outout of the level down. Or maybe sell the two channel and get a good 4 channel instead and hook it up to the stocks. Then maybe later upgrade rear speakers. Or you could just stick the people you don't like as much in the back.