Just to mention.
We moved house from one with a specially modified and treated listening room to a regular 4 bedroom, 2 reception room UK build. Because my daughter was attending a local university we gave her the main en-suite bedroom and I temporarily installed my system in a spare bedroom, which I intended to extend to roughly 3 times the size. I honestly thought it wasn’t worth taking a system out of its boxes, but that room turned out to be the best room I’d ever had. It was small, which mandated a system for near field listening, it was lossy in the bass, so required no bass traps, it was quite reflective, so responded brilliantly to bags of diffusion, and it was almost perfectly symmetrical in that left and right sides were almost identical save for a door. . The best speakers I audioned in the room were a pair of Magico S1 MkIIs, closely followed by YG Carmel IIs (I preferred the Magico top end).
I had been using the system for about 3 years, constantly improving the network rather than the Hi-Fi components. At one point my network had 6 rails of Sean Jacob’s DC4 and Mini DC4 power supplies, which sounded great. I then upgraded all rails to DC4 ARC6 and the Innuos Statement to Next Gen (ARC6 components). At the time, if someone had blindfolded me and asked what I had upgraded, I’d have guessed that the S1’s had been replaced with M2’s. The bass became so extended, lively and physical and the treble so pure and extended that an upgrade to a different class of speaker was clearly the best explanation for such profound differences. The lesson i learned from this is that the ‘characteristics’ of loudspeakers is extremely dependent on the quality of what’s driving them. Now I know this sounds obvious, but until this instance I never dreamt that the dependence could be so profound in nature. So I can imagine that the sound of a pair of M9s can span everything from ‘utterly, unbelievably magical’ to ‘not really my cup of tea’ which of course means opinions about the speakers will likely vary by a similar degree.