I heard just a tiny bit of this on the Magico A3. I have a few tracks that bring it out - some Johnny Cash and even some Julie London tracks.
It wasn't nearly as bad as a number of other speakers, but it was there.
Personally, the best I've ever heard in terms of lack of that type of coloration has been my (now departed) Thiel 3.7 speakers. It just didn't matter what range a singer was in, low, high, everything in between, there was never a hint of unnatural bloating or mechanical intrusions - just pure, rich, natural and utterly free of any boxy sensation.
Another torture test is some Russian Orthodox Choir music (e.g. Ancient Echoes is an amazing CD!), with Basso Profondo voices. These guys go so low you'd think the church organ had kicked in. Once they hit those low notes you really start feeling the bass in your system and unless a system has really neutral, controlled sound it can sound more like "speaker bass" than human voices, or take on some speakerly quality.(Again, the Thiels just nailed this without breaking a sweat. Others I've tried, not so much...)
(My current 2.7s are very good, but not quite as "perfect" to my ears in that regard).