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

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?

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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