Aria FEB with a doublebass radiused board.

[Andyjr1515]

I think the tests you've done that I'd missed confirm that one isn't needed @Maude 

For acoustics, anything you add or take away changes the sound.  For a DB, as with a violin, the soundpost is integral to the design of the sound box.  For a standard X brace design, it isn't.  That might make a tangible difference or be negilible, but there will be a difference.

But, for non-academic perusal only, if I was putting one in to stop the top collapsing, I would put it where that danger exists, which is under the bridge. 

But don't lose any sleep over it because I might well be completely wrong on every aspect of the above