Behringer C-1 Microphone Hum.

[Lodgey]

I recently purchased a Behringer C-1 XLR Microphone as well as a Behringer Q802USB Mixer which works well however i am getting a hum from the microphone. This is my first XLR microphone so i got a XLR cable and a phantom power supply just in case it was needed which turns out the mixer does provide +48v that are needed to supply the microphone with power.

This hum how ever cannot be filtered out, i turned levels down on the mixer and on the computer and the hum remains so i took the set up apart and tried it in another power socket around the house and just held the microphone in my hand and the hum had gone, i put the setup back where i initially set it up and the hum returns, the microphone is in a microphone stand that tightens onto my desk and the mixer also sits on the desk.

I did more tests and if i touch the microphone the hum goes away also if i touch the side of my pc case or the XLR cable that plugs in the base of the microphone the hum in the microphone goes away, so im thinking its a ground loop issue? but i dont know how to solve it the cable is XLR to XLR so i cant use a isolator and the XLR hum eliminators are rather expensive so am i right in thinking this is a ground loop issue and is there any advice on fixing this?

Thanks in advance for any help offered.

 

[EsaT]

Ground loop commonly happens when interconnecting equipment getting power from different wall outlets.
Touching case really shouldn't affect it.

But if outlet is non grounded EMI filtering capacitors of PSU make case float in half way between live and neutral.
In which case it could have effect.
And if microphone equipment offers some connection for that to neutral that would cretainly cause unwanted currents.