In reply to:
they sound remarkably similar, with the exception that the MAs are "softer" sounding and project a more recessed stereo image.
Thats what I found with my old Silver S6. But if you actually compared A-B on both speakers that recessed stereo image is actually the soundstage 5-10 feet behind the speakers while the M60 has a more forward 1 foot in front of the speakerse presentation. The MA has a greater depth in soundstage at least thats what I found with the MA S6. The S6 nonetheless had a similar sound with the M60. But I found the MA S6 to have greater bass than the M60. And no ... the MA S6 does not have a bass hump. The M60 does not have a flat frequency response in our regular rooms.
Considering the M60 is cheaper ... if one can't chuck out the extra cash for the MA S6 or MA S8 then the M60 is excellent. But for those of us labelled "Elite" that CAN afford it...hell I'd take the MA S6.
I would really like to know your findings BigWill & Curtis. As all rooms are different and outcomes can vary. In your case the M60 can be king.