I expected the 660 to triumph. Assuming the algorithm for deriving the listening window and sound power is the same for 80 and 660, I can't see how the 80 can sound better given the more linear behavior of the 660. I will say that positioning matters a lot. Maybe the algo is not the same and that means we can't directly compare the curves of the two.
My active LFRs blow the M100v4 away in absolutely every category. But I had to fiddle with positioning for months to achieve Nirvana. I know Alan admonishes me when I say "blows away" but it really doesn't take an audiophile to hear the difference between the two.
