Very interesting Matthias.
I remember when many of us were experimenting with ferrites on BNC cables between the Chord upscaler and the Chord DAVE DAC, there was a cut over point where the improvement max’ed out. At the time, I attributed it to the tradeoff between BNC length (longer was poorer) and ferrites count (more was better). The physical space required for ferrites seemed to drive the tradeoff.
The v3 cable is interesting because we can do more windings on the torroids as well, not just add ferrites
Of course, the most intriguing part of Eric’s work (for me) has been his ability to measure common mode noise and correlate that to SQ improvements. If I had the equipment, would be facinating to play with other cable filter configurations and see what frequency range my system is most sensitive to, and filter even more aggressively there.
Wonderful to have a measurable hypothesis that correlates with the empirical differences we hear. Alas, I no longer have access to lab equipment at work these days, so difficult for me to get a proper measurement setup going here.