I worked for Magnolia for a bit and when they had the KEF Blades hooked up to Macs they sounded mushy, compromised, and not performing at the level they were capable of.
Are you speaking about McIntosh amps? If so, then I do agree that McIntosh amplifiers are too laid back and soft in the mids/highs.
However, from what I understand, the McIntosh processors do not have this laid back / mushy sound. Can you confirm this?
I'm basing this off another comparison. I had a friend bring a Marantz AV8805 directly to my house for testing. I was impressed with the fullness and power of the sound from Marantz, but when I hooked my S1200 back up, it was apparent that the Marantz had rolled off softened high frequencies. From what my friend was saying, the McIntosh processors did not have this effect.