Any of you guys messed with the new CVRT subwoofers from Kicker? I'm looking to possibly replace my 15" CVR with 3 of them to save space in my Blazer. I was thinking about making a box that'll put all 3 of them up against the back seat firing towards the rear in a sealed box. I was told they don't do so well in a vented box, is that correct? Any and all info would be great!