I did a noise floor test with the MKVII+ using a digital test CD with recorded "O" data, yesterday. With the MKVII+ in high gain mode, I could BARELY perceive some noise if I raised the volume control knob to the 90-100 position. Below 90, it disappeared. In low gain mode, I could not perceive any noise at any volume setting. I can't imagine anyone having a noise issue with this amplifier with any impedance headphone played at any volume. If someone does find a noise problem, it is probably being generated somewhere else in their audio chain.
This is a very impressive noise characteristic, especially for an amplifier that has it's power capabilities.
Speaking of power, in high gain mode I could not get the volume control above 40 (11 o'clock) comfortably, even with recordings that were mastered at the lowest of levels. This amplifier is powerful!
For all intents and purposes, the amplifier has an extremely quiet and "dark" background, even when in the high gain mode.