I have a Alpine PDX-5, 4x125@4ohm and 1x437 (birth records). I have a JL10W3 on the 1x400. I have a component set of Focal 5.5", with the 5.5" in the door and the tweets in the dash. I also have room in the dash for 4", and I'm planning to put a 4" Focal mid (either Utopia or K2) in the...