Well i have never heard the XCON subs but i have heard the BTL and its a damn good sub, If your not worried about build cost i would say the saz is the way to go as i have heard nothing but good things about them. But if your wanting cheaper i know the ap30001d is half the cost. But if i had the money i would go with the BTL and the SAZ
Ok well im new on this forum but have been on ca.com since 05. I heard about this site as i was searching Fiaudio's myspace page. I just thought I would come over and see what this site had to offer.