ok... i dont know too much about component speakers..

but if i buy a component set for the front, and a pair of 6 1/2s for the back... can i power all 6 from 1 amp?

and then would the car be able to handle another amp for a sub? would a capacitor with a high farad make that work better?

 

you can buy a 4 channel amp and a sepret class d fo the sub you only need a capacitor if you system draw to much power that your lights dim