There is good reason to think things like this work some sort of effect on the field, which is after all the music signal. Most talk about electricity using the water metaphor, which is all well and good but hopelessly inadequate. Water in a pipe is not affected by radiation outside the pipe. Electricity in a wire most certainly is. This is in fact the principle upon which transformers, phono cartridges, amps and speakers all work.
If you look at any of the Synergistic Research fuses or AC outlets you will notice little blobs of goop stuck on there. They will tell you not to remove the blobs. If sold separately people would mock the blobs. Heck they mock the fuses, they are like Walt in Breaking Bad, "I am the one who mocks!" But it is no surprise the blob is one of the active ingredients.
QSA fuses, when you go up into the more expensive ones they have black stuff stuck on the outside. The more expensive the more black stuff. What is it? How's it work? WTF cares????!!! Are you trying to improve your system or make your own? If improve your system I strongly suggest ignore WHY and focus instead on WHAT. When people say they hear it, do you want to hear it? Or do you want to argue about why?
If you want to build your own then in that case I strongly suggest start reading mahgister. He is doing all the same stuff, only using easily obtainable inexpensive ingredients. Go ask him why. Me, I just want the sound.