Question Faint whistling noise from desktop speakers ?

[mahdimz]

Hey there. I have recently bought a desktop speaker set that has one 20W subwoofer and a pair of 10W speakers. The subwoofer itself works perfectly, not even a bit of noise at the maximum level but coming to the speakers, they have a very weak noise which gets on my nerves.

Not talking about the common noise caused by increasing the volume too much, it's like the sound of weak whistling noise caused by some electricity issues maybe. By the way, it's different than the noise caused by touching the 3mm input.

If I put the volume down on 0, the board shuts the electricity for the speakers so the noise ends but it's present starting from the volume 1 to the maximum volume and doesn't getting weaker or louder.

I reached to the guarantee company and they told me such a weak noise is normal, but I convinced them to change the whole board and they did.
That noise got even weaker but I was still hearing that and they didn't accept changing the board again, saying that I'm just too sensitive and such noises are normal!

What could be the reason of this noise? Can I stop it by installing something on the board? some filter, de-noiser or whatever they're called? The noise is too weak but it really goes on the nerves when there's nothing being played.

This is a record of it, don't mind the environment noise, just the whistling noise.

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[Lutfij]

The noise, you speak of, is what you hear when you have a grounding issue in/on your power lines in your abode. You could use ferrite chokes on the wire running to the speakers. That only mitigates the white noise slightly, it won't remove it.

You should also look at the speakers wiring as well. Could you please pass on the subwoofer and speaker's make and model. Pictures of the wiring would also help two fold.

Audio output device? Soundcard?

 

[mahdimz]

The noise, you speak of, is what you hear when you have a grounding issue in/on your power lines in your abode. You could use ferrite chokes on the wire running to the speakers. That only mitigates the white noise slightly, it won't remove it.

You should also look at the speakers wiring as well. Could you please pass on the subwoofer and speaker's make and model. Pictures of the wiring would also help two fold.

Audio output device? Soundcard?

The speaker is from a local brand you couldn't find any info about it in English. It's TSCO 2182

This is a photo from the speakers and the cables:

And these are the front and back sides of the main board:

When the guaranteed company had replaced the board, this was the noise:

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I told them to put the first board back and this is the noise I encounter now:

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It has these input modes: x2 AUX, USB, SD Card, Bluetooth and FM radio.

The sound quality is really good and there's not even a weak noise on the subwoofer itself.
As I said the board shuts the speakers' electricity if the volume is on 0 but I also noticed that the electricity will be shut by the board if there's nothing being played in Usb, SD Card and Bluetooth modes but on AUX modes the electricity is always on if the volume isn't 0.

I thought of disconnecting bt or fm from the board to test but I'm not sure which one of the sockets should I disconnect neither if it will reduce the noise.
I'm just confused where should I mess with haha

 

[Kona45primo]

Just turn them off when not in use. That was my solution. Many self powered speakers are going to have random noises.

 

[stonecarver]

A lot has to do with the horn load of the front baffle for the tweeters. All speakers hiss to a point and add in computer speakers are used in a near field listening position and yes that hiss can drive you nuts.

Some people have gone to the of length of taping felt around the tweeter to soften the projection the tweeter produces "hiss". You don't cover the tweeter it's self just the plastic horn baffle the tweeter uses.

Not telling you that you should add the felt just giving you what others have done to live with it.

 

[Eugene$$]

try ground noise isolator