Clarion Marine Radio What Size Amp For A Bazooka 10" Marine Bass Tube?

What size amp for a bazooka 10" marine bass tube? - clarion marine radio

Sm104 I have a bazooka 10 "tube under the sea APX480M I am currently with a Clarion 640W 4-Channel is. I want something that always sounds good to take, but consume less energy because it is in the same boat and battery life a concern. Any suggestions?