From what I can tell, the major differences (as far as reproducing audio) is just 3dB lower on frequency response and -3dB Lower Limit on the 650.
Has anyone done a comparison between the two? I am more concerned about music than home theater for myself.
I have LSi9 fronts, LSiC, and LSiFX.
Paul (which also has the 9 fronts) uses the 650. Is that going to be too much boom?