After building many subs over the past 2 years, around which I've used 23 different drivers (10", 12", 15" and 18") from a half dozen manufacturers, I've recently built some subs using 12" and 15" Brahmas and 15" Tumults, all with XBL2 motors. In this world of BS marketing and specs, it's been a pleasure to experience products like these from a great bunch of guys, through a great dealer (Kyle ). The theory is sound, the information is there for the asking and the product delivers in every way. A bit later this summer, I'll post some pics and specs for those who are interested. It's always cool when Mr. Wiggins shows up on these boards, IMO. He's articulate and knows the subjects he writes about. I come here every day to see what's new, enjoy other's fine work, soak up experiences and digest theory, but I don't post much. After testing my latest 2XTumult, sealed, L/T, 3,200 watt LFE sub I just felt compelled to voice appreciation.