well, what I might suggest, is going to look for either a 6 ch amp, or something along those lines, or even a 5 ch amp, or,

hell um, like autozone has like a 4 inch wide amp thats would work, its like 43 bucks, should do fine, just do a jumper line for your input, and we can gain match to make sure its staged right, and hide that little amp in the body panels idk, its a thought, but gonna be a bish to run wire to.