Car audio, capacitor, amp help?

[Neil]

I have 2 1100W Dual 12's on an 820W AL amp. I am planning on buying an 1800W Kenwood amp another 1100 or 1200W sub for the AL. I'm basically looking for a way to keep from draining too much power wiring instructions. What kind of capacitor should I get? Also power wires, is it difficult to connect two amps from one capacitor? What's some suggestions? Thanks