question about back graduations

[Arnold Schnitzer]

I read some of the dissertation Ken M linked. What I found most interesting was the response of players to the round vs. flat back comparison. Comments were all over the place and contradictory. The author pointed out how subjective the whole subject is. I personally think there is something to having a "spring" of brace wood under the soundpost, regardless of whether the bass has a round or flat back. I have had the opportunity to add a back brace to a round backed bass on several occasions, and felt the bass responded quicker afterward. Ken S. has some experience with this as well. Your comments, Maestro?