Science or Snake Oil ?
The British Audiophile suggests trying a ferrite core over one wire near your speaker. ???
Won’t do much at speaker voltage. Line level, signal level from RCA or 3.5mm is a different story.
The only reason I’ve used them on speaker wires is to cover up a visual blemish.
RFI suppression? But a well designed amp should already have this issued covered.
See if that British guy has any skin in the game when it comes to selling these things. Too many shills out there hyping stuff for a little commission these days.
Thx, answered