I am thinking about evolving my current 5.1 system into a 7.1 system using Audyssey's DSX or DTS: Neo with Heights. I haven't seen a lot on this board on using multi-speaker configurations with Ascend products. What I am thinking is

LCR - Sierra 1's
L/R Heights - CMB 170's
L/R Rears HTM-200's.

Has anyone tried this? Also, based on my cursory review of Audyssey and DTS, they have different positions for the "height" speakers. I wonder if there is a fudge factor where I can place the heights.

Thanks!