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I forgot to answer the second part of your question: It is mor a "hiss"... somehow like you would take "pink noise" and remove all ferquencies lower than x, means: sounds to me like a mixture of several higher frequencies.
Regarding/Summarizing the other posts:
- Up to now it seems that other members here have same or at least similar experiences (I never had anything similar... and I am quite sensitive to noise, maybe I just was lucky up to now...). So it seems to be a comon thing... not nice maybe, but at least common...
- The noise is most probably not related to the implementation type (class D in this case)
- Regarding the suggestion testing XLR-Input: The noise is also there if NOTHING but the speakers are connected to the ST-10 or STA-9 (no Pre-amp, no RCA connection, no XLR connection, I even tested with no other electrical device in the room, and also in an additional room). I do not have the possibility to test XLR, but I guess the test would not change anything, because even with no connection at all the noise is there. Within my limited possibilities I can connect whatever wherever I want: The noise is there and does not change.
But... does somebody know where this noise is coming from (I mean the technical root cause)?
Or is it just hard or impossible to say because in every system/amp there may be different root causes?
Your description of the sound as pink noise-type hiss but without low frequencies is exactly what the generic electrical noise floor of most equipment sounds like. It's nothing to be concerned about per se, but IMHO if it's audible from any distance it's louder than it should be - reasonable people can debate whether equipment should be 100% totally silent, but I would think we can all agree that any noise should be quite minimal and at a very low volume level.