I made some home made pigtails with a blob of ferrite (my idea) on the end.
Stuck them in at the negative terminal of the amp/speaker.
And on unused neutral A/C outlets.
They are a nice addition to tweakyness.
I discovered too many does go too far, as I had added eight sets to the amp, speaker wires at the speaker etc. Removed some, especially the ones on the positive terminals!
Final implementation on the amp negative outlets, a group of seven 1" long, 1/2 inch diameter ferrite tubes from American Science and Surplus, tightly bound with small zip ties into a bundle, with the pigtail wire stripped a long 20" and wrapped through them so the ferrites all have good contact with the wire, and the wire wrapped back to itself. I have the Ferrite clusters in coffee cups to avoid any accidental electrical contacts.
At the speaker ends I have a single ferrite on a pigtail at the low, and mid/high connectors (biwired Maggie 3.6s)
The ferrite pigtails on the outlet ends are just A/C plugs with a wire on only the neutral line, and the ferrite at the end of the pigtail.(wrapped in blue heavy Teflon plumbers tape, just to be extra safe! would not want the 'hot' line to somehow be on the neutral side... and accidentally touch something) These actually look sort of cute!
My theory is the tweak started as just a short wire, then a wire with more stuff, and seems the realization that a lot more stuff is better. Thus my idea just go straight to a big electron warehouse, a ferrite. (any electron storage would do, ferrites are just easy. Some other folks are using 9 volt batteries as a ground, with only the negative side of the battery attached.
(I tried the battery tweak, and it is about the same results as the ferrite, I stuck to the ferrite as it was my own idea...and one would have to check if the battery was good or died..)
The result: more clarity, greater PRAT, and more dynamics.
The small loss of midrange warmth I had from using powerline conditioners was removed. And better low frequency presentation.
The nice thing about the EVS is the low price. A reasonable amount for those wanting a ready made product.
This is one tweak anyone can make, or buy at a very reasonable price, and is really worth trying out.