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I don' think that class D amps are generally exceptionally noisy (like explained by some other members here). The only "special" noise I know caused by the class D principle is the "switching noise", but this noise has the same frequency as the switcher or its harmonics (e.g. for the Nuprime...

Yes, you are right. And the word "switching" within the phrase "... the so called switching noise...", is an important detail within this context. And as far as I know (at least up to now, I am learning right now every day a bit more about audio-technique ;-) ), the word "switching noise" is...

I have received/read in another forum following statement: "If you listen close to the tweeter (within a feet), all variants of Class-D amps have the so called switching noise. That is normal and does not affect the listening experience. The noise level is dependent on the speaker's efficiency...

Initially, I wanted to understand the main reason (root cause) of the noise. If it is acceptable or not, is a different and subjective question. I personally agree with you: I prefer quite equipment (my Lyngdorf e.g. is absolutely silent, means I cannot hear any noise from speaker or device), so...

I was curious and downloaded a "Sound Analyzing" App: "My higher frequency noise" is (according to the App) mainly within a range from about 6 - 12 kHz, the maximum is in the range about 8-10kHz with a range of 35 - 40 dB(A), measured at a distance of about 1-2 cm from the tweeter. Quite sure...

Yes... from all that I have heard and read so far in the last days, in fact it seems to be "normal", at least within this application/equipment.

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...

OK... I just thought that it is a class D issue, so maybe this is wrong... And yes... the switching frequency is much higher, and if I still can hear it, it mus be less than about 13kHz (the noise, I mean)...;)

Hi and thanks for the answer. I already tried quite a lot, including: Connect only the ST-10 or or the STA-9 to speakers. No other connection (means: also no pre-amp), all other devices in the room completely disconnected from any power-socket. I also tried this test with different power and...

Thanks for your answer! I am using B&W 804 D3 speakers.

Hello, I am new here in this forum and joined now, because I have a dedicated question regarding class D amplifying technic: The situation: During the last weeks, I could test two different amplifiers from "Nuprime" (STA-9 and ST-10). Somehow I like them, but I had all in all three different...