Audio science: What causes the so called "blackness" of the stage?

Off-Topic
1

Hello. Just compared my aria and blessing 2 and immediately I noticed that the stage of the Blessing 2 is darker. Iv eheard about people talking about stage being dark or black. What is it?

2

As in when nothing is playing, there is just nothing audible?

My guess would be that having to do with a combination of the below:

  1. the bias voltage (= way to work around a property of semi-conductors) producing slight hiss

  2. the power supply coupling noise from the grid through to the amplifier section. This can be largely mitigated by proper EMI-filtering between the AC input and the PSU itself.

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