The specs for the 7100 list the damping factor as 400. The specs for the 770 list its damping factor as 850. I've been told the damping factor is a measure of how well the amp controls cone movement. Is that true? Does anyone know if a change from 400 to 850 is audible? Is this a valuable spec?

I'm curious as to whether the 770 would sound better than the 7100 at normal listening levels (not ear-bleed levels). 400 vs 850 sounds significant, except that it is possible to have a THD of .00001% and one of .000001% and never hear the difference.

Any thoughts on the damping factor specs?

Any thoughts on the 7100 vs 770 at normal listening levels?