I got a P12 a few weeks ago and love it - definitely an improvement in my sound, and much beter THD numbers. My question is what precision of the output voltage I should expect. Per the picture below, my voltage out is 121.6, which is close to voltage in (122.1). My setting is 120. The input varies a little on different days, and then the output varies with it with a few volts margin. Just not sure what I should expect, should the output be exactly 120? Is some fluctuation as designed? What do others see?