Hey Jeff - nice post.
You also helped force me to go over the data I got with my way too brief time with some of those loudspeakers at my secret testing facility. I had two days available to play with them and one day was rained out - I do this kind of thing outdoors...
Overall I was most impressed with the SH46 and TH Mini. You could add the word "surprised" for impressed. I have never heard a box the size of the SH46 go so loud for its size and weight - and retain most of the Danley sound and all its arrayability. Add to that the fact that the box uses passive crossovers... Amazing. The TH Mini is really fun and would be even more fun if it had the option of a built-in amp given that it's application will often be with self powered tops.
Another thing that truly surprised me was how easy the TH412 was to move around and manage by myself. They did a great job with the caster board design. The position of the drivers in the cabinet weights the thing so that it comes off and back on the caster board very easily for something of that size. The king of easy to move is the TH115, but the TH412 is very nice. The TH212 is goofy to move around, though it's lighter than the TH115 it feels heavier due to the layout. Nice sounding sub, but given that issue and it's price and somewhat steeper amp requirements, I'd stick with the TH115 unless its smaller size was critical for a given application.
The 12" driver TH subs have a bit of a different character than the 15" I'm used to. There seems to be a little more detail or something in the 12's, but at the point of overload the 15 seems to maintain its composure better and have a softer and more forgiving sound to it. Sorry for the subjectivity...
Now, about the TH412 - that thing definitely goes lower than several TH115's and sounds wonderful doing it. I'd need more output from the TH412 to justify it's cost though. The problem here isn't with the TH412, it's how good the humble TH115 really is. (2) TH115's have the same measured output as (1) TH412 and the TH115 covers the LF spectrum perfectly for 95% of the program content I deal with. VLF bang for the buck seems to land squarely in favor of the TH812, which I didn't have but I really want to spend some time with. One of those has about the same output as (4) TH115's while going even lower than the TH412, and in my experience, (4) TH115's a side will cover thousands of folks very nicely.
Green trace is a single TH412, white is a single TH212 and blue is a single TH115:
My little cost/benefit calculations on "upgrading" from the TH115 (ignores amplification):