Having heard the Mac gear at my dealer with the CW IV’s, I wasn’t impressed with the newer Mac hybrid gear. Seemed to get a little brittle at the top end.
Conversely, at home with the A21+, there is no end to the clarity and power these speakers were made for. I love the look and legacy of Mac gear, but too often they never get compared to newer higher end SS amps. Not saying Mac gear is bad, just saying they are not the only game out there for $5kish front end.