I also have second-hand testimony as to RK's willingness to assist in advising on used Atma-Sphere purchases. Don't expect this kind of magnanimous treatment from say, Luke Manley at VTL, or Richard Vandersteen. I wish more manufacturers understood the worth to them of helping to keep their gear's resale value and desireability high, instead of short-sightedly disparaging those whose second-hand purchases ultimately help fuel a robust primary market.
Atmasphere MA-1: mk1 vs. mk2?
There are currently a few Atmasphere MA-1 mk1 amps up for sale. Since they look quite different from the mk2, I wondered, how much of a difference is there between these two versions? Do they sound quite similar? Any reliability issues with the mk1? Is it possible/necessary to upgrade parts in the mk1? And do they mind any slight dips down to 3 Ohms in speaker impedance (Audio Physic Virgos)?