The M8-700m has extremely low distortion, typically 0.001% at 1 kHz. At 20 kHz distortion is still below 0.005%. Distortion at 50 kHz (a ridiculous and unreasonable measurement, but revealing of the total amplifier performance nonetheless) is 0.02%. At 100 kHz, it is about 0.06%. These extraordinary measurements, and the extremely low high-frequency distortion, are highly significant sonically.