Are ferrites effective for cabling?

So, you’re using my jokes now? 

Sad.. isn't it. How I have fallen.....

I stand under correction but we wind 10 turns of the cable in a loop for vhf transmission lines to remove any stray rf, perhaps this will work for audio...

Not sure I go along with making 10 loops in an audio cable to reduce stray RF, i.e., turning the cable into an inductor.

“The major goal of high end cables is to reduce inductance as much as possible.” - Tara Labs, maker of ultra low inductance audio cables

I am not diminishing the problem of stray RF, as we are swimming in a pool of RF.

I do 32 tight loops of 18 gauge around a 3/16" dowel to make a RF choke to stick in the Tweeter circuit in my Magenpan 20.7 speakers. 
Originally called the Al Sekela tweak, I modified the idea to be just a home made choke. It works great. and makes the treble from the tweeter smoother and better sounding. Since the ribbon is such a large antenna.... etc. Plus the fact the Magnepan tweeter is still effective near the 100,000 Hz range..