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 noise issues.
To make things not to confusing, I want to focus here only on one of the three noises:
If one of the amplifiers is connected to the speakers and powered (means: in state "ON"), there is an audible noise in the higher frequency range.
I do not know the exact frequency, but this noise is audible at the tweeter.
This noise is very low in volume, I can hear it up to a distance of appr. 20 cm from the speakers, I cannot hear it from my usual listening position.
The noise is independently from other connections, devices, rooms or chosen wall-sockets.
In another forum a guy from "Nuprime" stated with one sentence that is is "normal" and - as far as I understood - has to to with the "switching frequency". I asked for more information, but it seems that the guy noticed that it is not the best kind of marketing to declare an audible noise as normal ;-)... and did not respond any more to this issue in a helpful way.
So I wonder now, why this noise is "normal", because I already used two different class D implementations in my rooms (Lyngdorf TDAI 2170 and Dynaudio Focus XD active speaker), both of them are absolutely silent, even if you put your ear close to the speaker.
My questions:
Can a noise like this really be considered as "normal" in some class D implementations?
If yes, what are the differences in comparison to "silent" class D implementations, and are their any advantages in the "noisy" one?
Note:
Please don't get me wrong: I do not want to blame Nuprime (I still like their devices, and both devices are doing their "main job" fine,) and I do not want to judge this noise, I just want to understand the main reason (at least a little bit), understand the differences to other implementations, and learn a bit more what is going on... and of course any link to existing information is also very much appreciated... I guess I would anyhow need some time to read and understand ;-).
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 noise issues.
To make things not to confusing, I want to focus here only on one of the three noises:
If one of the amplifiers is connected to the speakers and powered (means: in state "ON"), there is an audible noise in the higher frequency range.
I do not know the exact frequency, but this noise is audible at the tweeter.
This noise is very low in volume, I can hear it up to a distance of appr. 20 cm from the speakers, I cannot hear it from my usual listening position.
The noise is independently from other connections, devices, rooms or chosen wall-sockets.
In another forum a guy from "Nuprime" stated with one sentence that is is "normal" and - as far as I understood - has to to with the "switching frequency". I asked for more information, but it seems that the guy noticed that it is not the best kind of marketing to declare an audible noise as normal ;-)... and did not respond any more to this issue in a helpful way.
So I wonder now, why this noise is "normal", because I already used two different class D implementations in my rooms (Lyngdorf TDAI 2170 and Dynaudio Focus XD active speaker), both of them are absolutely silent, even if you put your ear close to the speaker.
My questions:
Can a noise like this really be considered as "normal" in some class D implementations?
If yes, what are the differences in comparison to "silent" class D implementations, and are their any advantages in the "noisy" one?
Note:
Please don't get me wrong: I do not want to blame Nuprime (I still like their devices, and both devices are doing their "main job" fine,) and I do not want to judge this noise, I just want to understand the main reason (at least a little bit), understand the differences to other implementations, and learn a bit more what is going on... and of course any link to existing information is also very much appreciated... I guess I would anyhow need some time to read and understand ;-).