I had the atm2 which was better to my ears than McIntosh mc275 in terms of clarity, definition after having the mac for 4 years. I got tired of the sound and bought the atm211....OMG believe the reviews, its going to be one of your last amp to buy. Be warned its 20 watts but can push my sonus faber Stradivari as loud as the atm2 which is 75 watts in tube form. Depth clarity and stage in the best of its class........read all the reviews especially hifidelity pl.....its not 13k its 17k now.