I have listened to music through a Sennheiser SD580 and the only speaker IMO that comes close for ultimate detail and ambience is the Puppy 7. Mind you you don't feel the music like the Puppy 7. The Sennheiser can not create movement of air as a headphone. Secondly the Sennheiser SD580 has a wider frequency range 12hz-38KHz. The M2i is a bit smaller in range 70hz-22khz. The Sennheiser SD580 to ME does not image or soundstage as well as speaker. Your ears will be not be led to believe the stage is somewhere between 10-15 feet in front of you. Again this is my personal opinion.
In a room like that where you seemingly want the detail without the coloration of a full box speaker your barking up the wrong tree with the M2i. Your better of getting another brand in the likes of Revel M20, Dynaudio 1.3MK2, Proac Response 1S or PMC LB1. But all these brands go from $1700-$3000. The M2i at $255 can't be beat at that price point.
Saturn
ps:I do not state any of this in a negative way. Its just an opinion.
