Well he was asking about stiffness so comparing to a considerably stiffer racket wasn't all that helpful
My guess would be that it resembles an Arc10 or somewhat softer version of it - the adipower Pro was very similar to the Arc10 according to kwun, and the Duoforce should be a bit softer and head lighter.
Is the adipower tour somewhat like an equivalent to what the Ti10 was? I've been using my F9 for a while and it's a great attacking racket just not really nice at the net...Ti10 is probably the most well balanced racket I've ever used...any models from adidas fit that description?
I don't know much about Ti10 but I tried a pair of Ti10 2nd gen borrowed from a friend. To be honest, I don't think they are head-light balanced as written on the shaft, more like even-balanced or slightly towards head-heavy. I can't get the exact dry BP but I believe it would be closer to Adipower Pro instead of the Adizero... CMIIW.
Noticed that there are many reviews of Ti10 mentioned about the differences between the 1st, 2nd and 3rd Gen, also the Limited. The Ti Mesh sizes on their frames are different too, probably this is the parameter for each spec and also contributes to a certain durability issues.