RCA cable Magnetic interference measurement and comparison

[Lambda]

About the ferrites, do you know how much different "mixes" make?

It can make a difference. For this application you want maximum permeability (and therefore maximum "AL")
But the generic random cheap ferrite clamps seam to have okay AL/€
Good ferrites might me 4-10 times better but they are often more then 10 times the price to.

The one i have cost 2€ for 10pcs and the have an AL of ~4µH ( i don’t know material/mix)
You might find a core with 10µH but its likely cost way more.

 

[Speedskater]

Once again Audio Engineering Society go-to interference expert Jim Brown to the rescue:
A Guide to RFI, Ferrites, Baluns, and Audio Interfacing

http://www.audiosystemsgroup.com/RFI-Ham.pdf

and
Measured Data For HF Ferrite Chokes

http://www.audiosystemsgroup.com/FerriteDataHF.pdf