Soracyti
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ā¢Created by Soracyti on 10/9/2024 in #tech-help
Mic picking up EMI noise
TLDR, Micās coil is picking up EMI from GPU. What should I do to eliminate it?
Hi, I'm new to this server.
I bought a RODE Podmic, a dynamic mic, to replace AT2020, hoping to reduce the audio leak from my K702 open back headphones entering the mic that cause an echo problem to my friends over Voip.
It did work, but introduced a new problem. I think the coil in the mic is picking up EMI from my PC.
The following are two examples.
https://youtu.be/HFmZ1S7aZMw
This video is when the system is idle. Normally I couldnāt hear the noise, but once I move the mic closer to the PC case, or point the mic towards the case, the noise became audible.
https://youtu.be/ZK_oFd3q_eM
The second one is when GPU is on load, in this case a game. The noise is audible when the mic is away from the case, and gets even worse when being close to it. You can hear the pitch shift with the gameās framerate (though I didnāt show it cuz bf2042 no longer allows RTSS overlay after changing its anticheat engine), and when ever I switch the scene, the pitch shift as well.
Iām surprised nobody seems to encounter this issue since all the info I can find that related to this topic are four post from different forum and only one of them seems to have the same cause as mine which is this one:
linustechtips.com/topic/1511291-trying-to-deal-with-gpu-coil-whine-in-microphone-audio/
Spec list if that helps:
CPU: 5950x
MOBO: ROG Strix B550-E
GPU: Inno3D iCHILL X4 3080Ti
PSU: Cooler Master V1200 Platinum 1200W (Grounded)
Case: Fractal Design Define 7 XL Black TG
Audio Interface: MOTU M4 (Podmic connected to mic in 1)
I tried using an in line mic preamp, and switching XLR cables, didnāt affect the noise at all. So the noise must be introduced on the mic, not the cable or the audio interface.
Itās not audible to human ears (except GPUās physical coil whine), so it must be EMI.
Itās not affecting my AT2020 which is a condenser mic, so it must have something to do with how dynamic mics work.
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