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Buzz from mouse in speaker

Hi!

I just registered here, because i am at my wits end, and hope someone has some insight. I have a buzzing sound in my speakers, which gets stronger when i move the mouse. 

My setup: 

Desktop computer - Mtrack Duo - Marantz 1530 stereo amplifier

The sound is a kind of high pitched buzzing static, which corresponds to activity on the computer, most notable mouse movement. I can also hear it at a low volume from the mobo itself, if i put my head in the computer with the speakers disconected.

It´s also transfered if i connect from the onboard motherboard audio card straight to the amp. I can however not hear it in a pair of headphones. Plugin into an active stage speaker greatly reduces the issue, to almost inaudible. 

Connecting another computer to the amp is trouble free. 

My best guess is that the source of the problem is coil whine from the motherboard. i have tried replacing the PSU to no effect. 

However i find it strange that the issue disapears when i connect to an active stage speaker. 

Does anyone have a sugestion for further troubleshooting or a solution?

Thanks in advance!

dundeyr

Showing 2 responses by cd318

cd318
2,636 posts
 

@dundeyr 

My best guess is that the source of the problem is coil whine from the motherboard. i have tried replacing the PSU to no effect. 

I think you're right.

Some Asus motherboards do exhibit this kind of behaviour, and no doubt other makes must do too.

 

I can however not hear it in a pair of headphones.

My Asus PC does the opposite.

It's clean through speakers but has that faint ghostly interference through headphones.

 

It´s also transfered if i connect from the onboard motherboard audio card straight to the amp.

Have you tried using a dedicated soundcard?

This is something I intend to try once I can figure out how to install it into the PC.

So many different cards, so many different motherboard sockets ...

 

 

cd318
2,636 posts
 

@czarivey 

I use Lenovo Q190 2012 model. It was made actually as a streamer, because it's DEAD quiet and has SSD to make it even more quiet. 

Recently installed W10, because W7 not in support anymore.

 

We've got some small booksized Lenovo PCs at work and they are also virtually silent.

My previous PC brought in 2004 was a Dell Dimension 8400 fitted with a Creative Audigy soundcard, and that was virtually silent too.

My current Asus PC from 2013 has an SSD, a quiet power supply and a low noise CPU fan, wireless keyboard and mouse, and so it's a shame that there doesn't seem to be any way of eliminating that headphone noise.

I intend to run W7 for as long as I can or until I can migrate to Linux. I use Windows 10 at work and can't say I'm a fan.

The noise is not terrible and many users wouldn't care but as we audiophiles understand, it's just not good. I suspect it is a motherboard interference issue as using the headphone jack on the back of the PC changes nothing.

As in the OPs case it is strange that the spurious sounds do change in volume and frequency without any obvious cause.

So perhaps someone with more knowledge of computer hardware could help identify the most likely possible causes here?

 

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