I have the M5HP as well as the Kanto Yumi and Angstrom Omega II 200 bookshelves. I consider them all to have that NRC-sound. All three of them nail the midrange, have no noticeable colorations, and sound more alike than different at low volumes. That said, the Kanto and Angstrom has a lifted treble that I cut by ~4dB/2dB respectively. The Angstrom also gets shouty when I push volumes into the 60 dB + zone (which is why I'm no longer considering sound bars with their tiny drivers).
That said, I keep the M5HP in my main system because I find that blending the sub crossover at 40 Hz instead of 80+ Hz is magical in my room. My AVR has rudimentary room correction EQ, but I leave it off because it makes no meaningful improvement.
