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The Duke · 25th Feb 2013, 11:18

Hi. It's been a long time but thanks for the reply.
I still have this same problem and have decided to get to the root of it once and for all.

The monitors are connected to the 3x rear stereo minijack outs of the xonar D2X (L/R, C/S, LS/RS). I use 3x: 1x male stereo minijack to 2x mono female TS cables to split the signal to the speakers. From this cable, I go TRS to the XLR inputs on the mackie MR8's and MR5's.
The noise is bad. Especially if I play a game with the gfx card under load and mute the speakers.
It sounds like a digital wasp or a quad bike in my speakers.
Now this is what I don't understand.......
I tried my headphones plugged directly into the different soundcard outs. No noise.
So I thought it was the cables or speakers, like you suggested.
I got my macbook retina out and just plugged the monitors in, a pair at a time, with the exact same cables. No noise. I wiggle them around and put the gfx under load, no noise.
So the noise seems to come from a combination of my PC, Leads and active speakers. But they all seem to work fine when used with different equipment on there own!?!
Really getting annoyed with this setup, as this makes no sense to me.
Is it my house wiring? Is it a ground loop?
Should I take my PC out the case to try and see if its the case?
Is it the motherboard?
If I go out of my 680GTX into something like a Marantz AV7005 with the balanced XLR outputs, will that cure this noise?
Does the macbook not make the noise as it was not plugged into mains + I could only try 2x speakers at a time and not 5.1? (Thus less chance of a ground loop?)
If you could suggest anything else I would greatly appreciate it. Ive spent thousands and it sounds worse than a £20 pair of logitech speakers from pc world :/
Thanks.

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25th Feb 2013, 11:18	#21
The Duke What's a Dremel? Join Date: Apr 2012 Posts: 2	Hi. It's been a long time but thanks for the reply. I still have this same problem and have decided to get to the root of it once and for all. The monitors are connected to the 3x rear stereo minijack outs of the xonar D2X (L/R, C/S, LS/RS). I use 3x: 1x male stereo minijack to 2x mono female TS cables to split the signal to the speakers. From this cable, I go TRS to the XLR inputs on the mackie MR8's and MR5's. The noise is bad. Especially if I play a game with the gfx card under load and mute the speakers. It sounds like a digital wasp or a quad bike in my speakers. Now this is what I don't understand....... I tried my headphones plugged directly into the different soundcard outs. No noise. So I thought it was the cables or speakers, like you suggested. I got my macbook retina out and just plugged the monitors in, a pair at a time, with the exact same cables. No noise. I wiggle them around and put the gfx under load, no noise. So the noise seems to come from a combination of my PC, Leads and active speakers. But they all seem to work fine when used with different equipment on there own!?! Really getting annoyed with this setup, as this makes no sense to me. Is it my house wiring? Is it a ground loop? Should I take my PC out the case to try and see if its the case? Is it the motherboard? If I go out of my 680GTX into something like a Marantz AV7005 with the balanced XLR outputs, will that cure this noise? Does the macbook not make the noise as it was not plugged into mains + I could only try 2x speakers at a time and not 5.1? (Thus less chance of a ground loop?) If you could suggest anything else I would greatly appreciate it. Ive spent thousands and it sounds worse than a £20 pair of logitech speakers from pc world :/ Thanks.