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Microphone audio interference - EMI?
Old 2 weeks ago
  #1
Here for the gear
 

Microphone audio interference - EMI?

I have been getting very large amount of EMI and fan noise with my current setup, I am using a Rode Procaster, connected to a Focusrite solo.
Spent some time trying to figure it out with a friend and seems like just very high levels of interference.
I have turned the Solo up to max gain, and Windows to 100 to showcase the problem, which does occur at all audo levels but the louder the settings are the more prominent it is, so might be easier to diagnose this way.
https://vocaroo.com/i/s0LZ61JDEFhn
In the first 5 seconds of the clip the microphone is in the location it would normally be in for me, and then after that I move it closer to the PC which amplifies the interference. Some of that is fan noise (generally my fans are quiet but mic seems to pick them up a lot) and then the rest is just awful static.
Here is a recording when I set the focusrite to 5/10 on the gain. https://vocaroo.com/i/s11BHm9rE4Ch
Connected everything to my macbook and switch the PC off. Midway through here I flick the switch the PC PSU is connected to at the wall off, and the squeel goes away as heard here https://vocaroo.com/i/s0ar0n8M4nbZ Though I am struggling to consistantly replicate that.
To make everything more confusing, I turned all power switches off, and PC off. Using macbook with battery only I used a blue snowball connected via USB and the issue of the high pitch squeel still occurs. https://vocaroo.com/i/s0HnrHwg1iPT.
So pretty much, whether I have any other electrical stuff turned on in the room or not, the issue occurs. Mic picks up a lot of noise from my PC fans (which arent very loud really) which doesn't help, but can manage that at least.

What steps can I take to improve this?
Old 2 weeks ago
  #2
Gear Head
 
Garage Rodeo's Avatar
 

Did you use the same interface and mic set up, on your laptop? Same thing?

Did you just get it? Or did this just start?
Could be settings, mic cable, or using same elec. outlet as computer, or faulty equipment.

I no longer have a focusrite, but in the settings, is there a checkbox with something like "enable loopback" that you checked on accident?
Old 2 weeks ago
  #3
Here for the gear
 

Quote:
Originally Posted by Garage Rodeo View Post
Did you use the same interface and mic set up, on your laptop? Same thing?

Did you just get it? Or did this just start?
Could be settings, mic cable, or using same elec. outlet as computer, or faulty equipment.

I no longer have a focusrite, but in the settings, is there a checkbox with something like "enable loopback" that you checked on accident?
All the setup was exactly the same, only difference was using Macbook/PC. Mic and focusrite had exact same settings with the Macbook, however Windows volume was generally louder.

I will double check the focusrite settings when I am back home to make sure theres nothing odd going on there
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