i am pretty sure im gonna get 2 kx.44 elemental design subs for my bmw 323i..what is a good amp that would power both of these subs. I was thinking either an us acoustic or soundstream but im not sure. Also should i get the kx.44 or kx.22?? i am a newbie with subs so i dont know what the difference between 2ohms and 4 ohms are. Is there any other subs that i should look into in that price range? i want a sub that hits hard but has a clear bass.