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I have a M-Audio M-Track MKII (USB) and I bought a pair of Behringer studio monitors recently and using 1/4 TRS cables between them. I hear permanent noise of the cpu on the monitors, even it changes with the movements of mouse. I was using studio headphones till now and never encountered this.

Btw I use 6 socket power outlet which an UPS is connected to it and my pc is connected to the UPS. The monitors are also plugged to one of the sockets on this outlet.

How can I overcome this issue?

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    are you 100% sure that the M-Track outputs and the Behringer inputs are balanced? – Tyler Stone Feb 18 at 22:32
  • Sounds like a ground loop issue. Try isolating the PC mains supply and ensuring the connections are balanced. If they are balanced, try cutting the ground line between the interface and speaker inputs. – Mark Feb 19 at 0:10
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    being able to hear mouse-ing is indicative of digital noise from the audio device coupling to the analog audio output, a classic fingerprint of crappy design. I have a Focusrite Saffire that does it too...it's not too bad with balanced I/O, but unbalanced is unacceptable. – Tyler Stone Feb 19 at 1:22
  • I am a bit newbie about this matter. So using 1/4 TRS cables means balanced or not? – user3080042 Feb 19 at 9:37
  • Well that means you have balanced cables. :) Look in the manuals for your devices and see if the inputs and outputs are balanced. – Tyler Stone Feb 19 at 18:10
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One thing that I found out btw is that when I plug Behringer directly with its USB to pc there is no more noise. It seems the problem is my MAudio Interface. But what will I do with that? Should I change my usb cable?

The USB cable is unlikely to be the culprit though it's the cheapest solution so maybe worth a try. If the MAudio device supports an external power adapter (rather than just USB power) then you might try that. And try plugging it into a separate power supply than the one your PC plugs into.

The full solution is probably to invest in a higher end audio interface. For example my RME Fireface set me back £700 but I've had it for years and it does a beautiful job. Or just try different interfaces but get them through a company that has an easy return policy in case they have the same problem...

  • I figured out the problem is about electricity. One technician suggested me to tape the plug's ground metal pieces and it really took away the noise. But NEVER try this at home if anyone reading this because even if it is solved this didn't seem safe to me. I will call and electirician to home and ask him about a safe solution about electric line. – user3080042 Feb 20 at 18:01
  • Oh yeah, "lifting the ground" is a classic solution amongst electric guitarists as well :) – Hari Karam Singh Feb 27 at 15:01

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