I'm glad you posted the review. I was, but you beat me to it.
For any one else, The review is spot on!.
I have been mucking around with my Dual core since early August and have a pretty good idea of what it can do.
My speaker system is a 2.2 set up. I run the D/C in Advanced mode "Normal" and "Off" settings with corrections at 200hz and 225hz.
Yes you can hear the difference, and can also fine tune the frequencies at 1 point increments.
I never knew how good my system could sound before the D/C.
I'll comment a little more later...being called to a much more important duty...I'll be right there dear...