The stand's coming along nicely. Hopefully I'll have time to put it in place tomorrow.
I haven't looked for any complete specs for my two subwoofers yet. I have have the 740Cs but the project I was using them for was completely designed for me, so I didn't have to use the TSPs for anything. I see that the 740P specs are on the Tang Band site, but no specs for the 740C.
http://www.tb-speaker.com/detail/1208_03/w8-740p.htm