^^ i don't see why you can't power the coaxials with just connecting them back like stock and running them off the headunit am i missing something??
i have an alpine cd player with 45x4 and 22 x4 rms, stock separates up front, Jensen nitro 6X9s in the rear, and have 1 amp for the 10 inch JL in the trunk. it's good enough for me.
i have some polk EX series 6 1/2s laying i around my room but they don't fit