jackercrack wrote:Interesting update... I noticed the meters moving on my presonus studio live when only a cable was plugged in...no Mic. So I turned the volume way up and I could hear the radio station very clearly. What was interesting...is that I could move the cable around and I could tune it to at least two other radio stations. One was definitely 106.5 WYRK Country, one was an playing 3 Doors Down...so maybe the Edge or Jack FM (don't listen to a ton of radio so not sure of the formats in town), and a third station I couldn't identify. With it picking up several different stations...I'm starting to think again that it may be bad grounding or some other problem further up the line as opposed to stations broad casting over their limits. It is especially bad on anything with a circuit board...active electronics, newer condenser mics. Reverb tanks are terrible...but makes sense though...they're the perfect antennas
Gonna to some more testing on the actual electrical wiring and see where that leads me. Looking in to RF blocking paint...really expensive but seems like it will definitely fix the issue.
jackercrack wrote:4Fingers. Is your practice space on the first floor? It may make sense that picking your cables up off the ground would help because I was reading that Earth ground literally displaces it's voltage on the top layer of the ground and that it can actually travel in to your body...so maybe your cables were picking up interference from the actual Ground.
I'm on the 4th floor...so I don't think it will matter...but it might. They could be picking up something from the ceiling of the floor below...I'll check it out. Anything is better than having to re do a take to move stuff around to reduce Shania Twain in the background Generally it's not even noticeable in the scheme of a marshal running on 11...but for voice over work it's a major PIA.
Sounds like your Presonus has crappy CMRR specs as well as maybe some questionable grounding. Or you are just using really bad mic cabling. A balanced cable plugged into a decent mic input circuit should give you good rejection of RF interference, much better than even a great unbalanced guitar or line level circuit. I guess if you crank the gain high enough you will eventually get to hear some interference on even the best cables and input circuits.
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