I’m used to mixing ITB but recently bought a little Behringer mixer as I needed the headphone socket and my soundcard didn’t have one.
Anyway, when I turn the volume up on the mixer there is quite an audible ‘buzzing’ sound. It’s not noticeable when the volume is only 50% up and music is playing. I’m not sure if this is ‘acceptable ground noise’ or something else.
Also, when I open some programs on my PC the noise sort of changes in tone.
When sitting at rest (no music playing) Abletons Spectrum shows noise across the spectrum (very low in volume, up to about -100db on the graph).
I have the Behringer Xenyx 1002 for the same reason - I also bought Belkin Pure AV Silver Series Digital Coaxial Audio Cable for about £14 expensive but cuts out alot off the noise - though if I ram the volume up over 75% then I do get noise
I suppose the ideal solution is to get a sheilded computer case if the exist
Hi, This sounds like a ground loop. This happens when you have two bits of equipment that have a different value for their grounds, i.e. one has 0V and one is floating above 0V. What you hear is the current flowing to true ground along the interconnect to your amp and then to ground.
This happens a lot with laptops when they are plugged in, but not on batteries. It sound like this is due the the mixer, does it have a PSU like a laptop? You could try earthing the mixer, it should have each pins on the back.
Another common solution is to disconnect the ground on the offening unit, but don’t do that because it is dangerous.
Maplin sell ground loop isolators. The cheap ones just filter out the sound, so you don’t want to do that. You can get good ones that earth you interconnects.
RF inside a PC won’t make any difference unless you have faulty fans. They sell lots of high end audio cards and UAD DSPs that are PCI-e without any problems.
[quote]TheAnt (27/08/2010)[hr]It sound like this is due the the mixer, does it have a PSU like a laptop? You could try earthing the mixer, it should have each pins on the back.
Yeah, it has a PSU. I didn’t notice any pin on the back of the mixer but I’ll certainly check later. Strange how the mixer manual says nothing about grounding, you would think they would address it if their own supplied PSU can cause ground loops.