Thank you for the prompt feedback,
I appreciate different points of view, but please consider that my question was specific to the electronics involved. I have no intention to change speakers, in fact these are only 6 months old as I just upgraded from SF Chamaleon Ts.
Also, perhaps I should have added a little bit of perspective to make my question more relevant.
I am very sensitive to treble hardness (as I also suffer from Tinnitus).
All my opinions are based on absolute subjectivity and my experience is that different people can have completely different reactions to the same system.
In my first home, I fought against my B&W CM10s2 connected to Emotiva XSP1 and XPA2: the sound was brittle, hard and edgy for me. Ditching the XPA2 for a Parasound A21+ helped somewhat, but it was only until I upgraded the XSP1 to a Mcintosh c47 that the light bulb went off: beautiful, creamy, gorgeous sound.
(I did experiment with an Antherm STR preamp which was a clinical, analytical disappointment, as well as Rotel RC1590 which was noisy, too warm and veiled).
For my second home I decided to try something different with Sonus Faber, and I was very pleased with their round, warm, albeit slightly boring sound. At first they were connected to a Marantz 8802/Parasound A21, and like any AVR the 2ch sound was just flat, uninspiring.
As I added the P6 and a Cambridge 851N for streaming, as well as a wonderful Doge 7 DAC, things really took off..
Whilst the c2600 and mc452 are a little bit of a shot in the dark, I had ample opportunities to listen to Mcintosh gear and with any speaker, in any setup I just found the sound lush, creamy, pleasant and a delight to my treble-sensitive ears.
So, please do share any expriences and opinions on the Macs in questions.
Thank you,
Daniele