The PHONE AMP G111 MK2 is the successor of the original G111 which was extremely popular. Multiple updates and improvements have been made. LOWEST NOISE: Because of low internal gain. Therefore the self-generated noise from the amplifier is not audible. HIGHEST OUTPUT VOLTAGE: Through 60 Volt internal operating voltage. Over 90 % of all headphone amplifiers in the market offer not half that voltage !! Therefore best suited for high impedance headphones. HIGHEST OUTPUT POWER: Because of powerful amplifiers able to deliver much more current a headphone needs. Therefore best suited for low impedance headphones and even magnetostatic cans !! HIGH DAMPING FACTOR: Through lowest output impedance. Therefore best suited for full control even over critical headphones with the guarantee to have flattest possible response.