Looking to do a different setup in my town car. I currently have a 15" L7 I want a set up at least as loud prefer a little louder.. I have a huge trunk, currently have a 4.5cuft box just inside area, and there is room for more... I was originally going to get 2 maw 15s because they are loud and ive heard they are great sq but now I'm considering a single IXL 18 or maybe even two MJ18s.. how are the SQ on the 18s and what would be louder the 1 IXL 18 or the 2 maws of the same power?