I agree, Alco.
I attended a fun day with friends earlier this year where we had lined up the Cyrus 1, 2, 3, 6, 7 and Mono-Xs, all with/without relevant PSXs where they could be added. And my Nait2. This all into Vandersteen 2ces BTW, quite an easy load.
Of all the Cyrus gear I liked the 6-without-PSX most; I clearly preferred the Nait 2 to the 1, 2 and 3. The 6 alone was just little clearer and punchier, like an Onix-OA21 - that's a good thing. Adding the PSU, or moving to the 7, or the monos was like upping the contrast control - more of something, but the result was a tad more unhinged overall at each step. At the Cyrus pinnacle it all sounded a bit like a cinema system - bold , impressive, clear but not remotely expressive IMO.