Thank you very much, I understand the flat coil well. I read both of the other pages but didnt see anything on " BP power." Also Would the 12" in the recommenced sealed box powered by a kenwood KAC-9105D(900w @ 2ohm) would be loud enough for an extended cab truck. Also, the amp says it can push 1 ohm, would it benefit much to get the 1 ohm voice coils? Last thing for 169$ could I get a better amp then that?