Hi Adrian,
Yes, you are correct. It was the original M60ti's that I found harsh and edgy on brasses, soprano female voices and somewhat sibilant on all vocals. It's hard for me to recall now, but it seems that edginess in the treble extended through part of the M60v1 series, but later in the series, Ian got rid of the edginess I complained about, and later versions I liked a lot.
I don't remember which version but in one of the later double-blind listening sessions to the M60, I pronounced it a "wonderful speaker."
Ian likely has the records of those sessions, and which version of the M60 that I really liked.
Cheers,
Alan Lofft
