I have used ferrite beads. They close the sound up. Now I put small magnets on my connectors.. it opens the sound.
There's a difference between a ferrite that affects induced magnetic fields and the affects of a permanent magnetic field on the signal... I haven't compared my little magnets to the expensive magnetic adapters, but small neodymium magnets are cheap enough to be worth experimenting with. I even found small magnets that link together to go around motors and such. I used 3 of them around my power cords to good effect.
Something like this, but the correct size..
https://www.apexmagnets.com/18mm-x-14mm-x-20mm-motor-magnets?fee=5&fep=167&gclid=CjwKCAjwuvj...
There's a difference between a ferrite that affects induced magnetic fields and the affects of a permanent magnetic field on the signal... I haven't compared my little magnets to the expensive magnetic adapters, but small neodymium magnets are cheap enough to be worth experimenting with. I even found small magnets that link together to go around motors and such. I used 3 of them around my power cords to good effect.
Something like this, but the correct size..
https://www.apexmagnets.com/18mm-x-14mm-x-20mm-motor-magnets?fee=5&fep=167&gclid=CjwKCAjwuvj...