I made a test with the Behringer Hum Destroyer ,here's the result:
This looks promising also. Pyle Audio PHE400 Hum Eliminator.
I did an Amazon search for both Pyle products. Found a guy doing a demo.
Both Pyle products did not work as advertised.
I won't be purchasing either of those units.
An AM radio tuned to static is a good RFI detector. Check out power outlets and wall switches. Dimmers in other rooms can put noise on the line that will radiate out in other rooms.If you find something that works, post it on the forum.
Last night I found that the power adapter to my Microsoft Surface Pro 3 was causing tons of noise. What's strange is that some days I have more noise than others. This weekend I was getting large spikes at 4khz, 8khz and 16khz. I didn't even have to have my guitar connected. Just connecting my guitar cable to my audio interface showed those frequency spikes. I tried different cables and it didn't make a difference. If I move the end of my cable's 1/4" plug around my room it picks up all different levels of noise. That's how I found my Microsoft Surface Pro 3 power adapter was causing so much noise.
Pyle has always been junk.I did an Amazon search for both Pyle products. Found a guy doing a demo.
Both Pyle products did not work as advertised.
I won't be purchasing either of those units.
We have had an ongoing issue in our church sanctuary. Seats about 400. The lighting is supposed to be all new LED's on dimmers.
I even ran my AX8 on a battery backup UPS without being plugged into the wall outlets, NO difference.
Lots of noise on high gain on humbucker guitars.
I'm trying to find the root cause. I'm open to suggestions
Pyle has always been junk.