If money is no object get one for each. You won't need it. You don't have to push a sub to it's rated limit to get it to sound good and be loud. Anyone who says that simply does not know what they are talking about. Jl slash series amps do rated. You'd better set the gain the way they tell you and don't use bass boost. I've seen too many blown from people thinking they could abuse them like a non regulated amp.