Seems as though no one in this thread really knows what they are talking about.
I can't comment on any of the products besides the Titanium but it's easy to say that the Ti is not an SPL sub. It offers a great blend of SPL and SQ though. Regardless of how the engineers rate the xmax, it still performs, and performs great at that. The only downside to them is the oversized surround and the price for which they are sold at retail. Nowadays you can find a new one for $300 (15")
Now ighettoboyi, if you would care to inform us as to how the Thiel Small parameters make you sketchy towards the Ti besides the rated xmax figures then I would really appreciate that. maybe I can learn something new.