im getting a 15 inch DC level 4xl in the coming weeks. what would be some good specs for a daily setup that will get low and loud? i will be running it off of a discus 2000.1 at 1 ohm. i've read on their website that any where from 3 to 5 cubic feet would do but have read on threads they like smaller boxes. for any of you that have experience with the xl's, what do u think? i would prefer to keep it on the lower end in terms of size.this will be going in a 1992 lexus es300 trunk which is surprisingly big.