Electrical noise through headphones while touching phone

[chives]

Hi everyone.

I'm not sure what exactly to call this problem.
Everything of mine is connected to the same power bar which is connected to one socket in the wall. Headphones -> RME DAC -> powerbar
Everything works as expected, but when I touch my phone (while its charging) or my heating pad with my headphones on or anything else with an electrical current in it, i will proceed to hear a pulsing electrical noise in my headphones (planar magnetic).

I seem to have tried everything and nothing works except when I use my set up with my macbook while it was not charging into the wall, i heard no electrical noise when touching my phone or anything else.
Does anyone know what this problem is called? I don't believe its "ground loop" issues but I have no clue what else to call this phenomenon.
Any help would be appreciated.

Thank you

EDIT: btw the sound goes away if i touch my pc case or rme dac (metal objects that are connected to the wall)

 

[staticV3]

Sounds like leakage current bleeding into your RME and reaching the headphone membrane.

Touching your PC case or the RME shorts this current via your arm so it doesn't reach the headphone.

I've had the same thing happen on my PC setup.

The solution is the same as with ground loops: switch to Toslink or USB isolators wherever possible.

 

[Soandso]

When charging my cell phone or tablet it definitely provokes a low frequency background hum in my Stax SR-003 headphones (an in ear model) when connected to it's bias energizer and a solid state amplifier. I tested all outlets and also power strip combinations in my 1 bedroom apartment with the full set of gear each time, but still heard some hum.

Now I charge my phone/tablet in another room, or unplug those in the same room when streaming music to the SR-003 Stax. Curiously, there is no low frequency hum heard through the Stax standard bias SR- Lambda (an around ear model) when any phone/tablet are charging in the room. My guess is the in ear Stax's component size may make it susceptible to the charging phone/tablet emission; while the normal sized Stax's components might effectively immediately dissipate the charging phone/tablet emission.

Placing ferrites on all combinations along the array of assorted connecting cables didn't knock the hum out entirely. Opening up the energizer and amplifier to try tightening down their transformers and check for chassis vibration didn't matter either. And even when the phone/tablet is not actually connected to the charger if the "lightening" charging cable is plugged into the wall charger at the wall's electric outlet then the in ear Stax immediately forcefully buzzes if I just touch the exposed charging cable's "lightening" tip.

 

[chives]

Cheers for the knowledge. Will try a USB isolator.
I imagine any isolator will do? USB from rme -> isolator -> pc?

 

[staticV3]

Cheers for the knowledge. Will try a USB isolator.
I imagine any isolator will do? USB from rme -> isolator -> pc?

It should be USB High Speed (480Mbps) compatible.

@MC_RME recommended this one: https://www.amazon.de/-/en/SH-G01L-Isolator-Supports-High-Speed-Insulation/dp/B0CSYNSZ3K