I recently decided to upgrade the stereo in my truck. I like my music loud when off road. I have the configuration figured out and need help with how to execute my plan. I want to put 6x9 speakers under my two front seats, bringing my total speaker count to 6 plus 1 12" sub under the rear seat. the sub is powered by a mono channel amp. How can I power the remaining 6 6x9 speakers with an amp? All I can find is two and four channel amps for a reasonable price. Is there a way to loop the speakers so they all receive the same power through a 4 channel, do six channel amps exist, or is there a better powering method? Should I just give up on the two extra speakers?