Put a Furman Elite 15i on my system. Helped the sound. Then I went on a mission around the house and plugged the chargers and lamps, etc into Furman PST8. Electrical noise goes either direction in the wiring but still the idea of blocking it with a filter makes sense vs plugging a passive device into a common outlet. I currently have 3 of these PST8 AND the 15i. A very nice improvent for not much money.
Smaller plug-in AC Purifiers -- Shunyata, iFi, Puron...something else? What do you like?
I like the Shunyata Venom Defender. It does a good job of reducing noise in my outlets.
I'm wondering if others have tried similar, plug in products — such as the Puron Power Filter or the iFi AC Purifier or something else.