I already mentioned this, but my room is 18' x 20' x 12' ceiling. It is open on 3 sides.
Yo-Yo Ma: Ecstasy of Gold - sounds really great. Awesome cello music. Really large soundstage. Crystal clear.
Ennio Morricone: Trio - Crystal clear sound. Great horn music. Very large soundstage.
Richard Clayderman: Marriage D'Amour - Crystal clear, awesome Piano music. Large soundstage.
Richard Clayderman: Moonlight Sonata - crystal clear, awesome piano music, large.
Trevor Jones: Last of the Mohicans: Main Theme and The Kiss - awesome strings music, large soundstage, clear.
DJ Dado: X-Files Theme Remix - awesome dance remix music, awesome energy sound.
Dave Mathews & Tim Reynolds: Crash Into Me - awesome acoustic live music, super clear sound, large. Amazing sound.
Philharmonic Audio Demo CD (17 tracks) - Amazing sounds. Crystal clear. Large soundstage.
Impression: great speakers. They sound much larger than they look. Crystal clear sound.
Do they sound better than Philharmonic 3, Orion3, KEF Reference 201/2, or Salon2 in terms of midrange/tweeter/soundstage/image? Not quite. Not fair comparison in terms of price.
The M1s certainly hold their own for sure! That is 100% certainty.
Then again, the M1 sound a lot better than some $8K, $14K, and $25K speakers I've auditioned.
Now get me them HET1 speakers!