Jimhsu, I like Dorkwad's suggestion of an adjustable-tuning speaker and diagonal setup. In some cases a semi-diagonal setup works better; imagine rotating the speaker-listener-speaker triangle only about 15 or 20 degrees instead of the full 45 degrees that would take you all to way to the diagonal.
Given that you own M-60s, attention should be paid to the impedance curve of the speakers. Above 8 kHz or so, the largest Shahinian has an impedance of about 1.5 ohms, and this will result in a dull tonal balance given the M-60's relatively high output impedance. Presumably smaller model Shahinians have a more friendly impedance curve, but that should be established before you vote with your wallet. Coincident and Reference 3a have much more friendly impedance curves. Your present speakers, the B&W CDM-1s, do not have a particularly friendly impedance curve; I would expect them to have some excess energy between 1 and 2 kHz when driven by the M-60.
I do like the way the larger Shahinians interact with the room, but there are alternatives that are more compatible with Atma-Sphere amps.
Duke
dealer/manufacturer
Given that you own M-60s, attention should be paid to the impedance curve of the speakers. Above 8 kHz or so, the largest Shahinian has an impedance of about 1.5 ohms, and this will result in a dull tonal balance given the M-60's relatively high output impedance. Presumably smaller model Shahinians have a more friendly impedance curve, but that should be established before you vote with your wallet. Coincident and Reference 3a have much more friendly impedance curves. Your present speakers, the B&W CDM-1s, do not have a particularly friendly impedance curve; I would expect them to have some excess energy between 1 and 2 kHz when driven by the M-60.
I do like the way the larger Shahinians interact with the room, but there are alternatives that are more compatible with Atma-Sphere amps.
Duke
dealer/manufacturer