I just bought a pair of 60 Ohm headphones (Takstar Pro 80, on the way), and just saw a group buy for the Aune X1S. People are mentioning something about the "rule of 1/8" in which the output impedance of your amp should be less than 1/8 of your headphones. People are also saying that the Aune X1S has a 10 Ohm output impedance. Can anyone confirm or deny this? I looked on Aune's website, a digital copy of the manual, etc. and can't find anything concrete!