At a dealership, I heard the Nordost system and I was quite impressed. As far as noise is concerned, the system was dead quiet before the boxes were added, so it does far more than reduce audible noise. What I heard was a more natural sound--images seem to float more freely in space and sound much more like a live event. I seriously considered a purchase, but, there would have been problems grounding my entire system--you need an unused input on each component and my amp only has one set of inputs (chassis grounding would not work).
Grounding boxes which ones have YOU tried? And results?
Just curious have never tried the many grounding devices that can be found on the web from companies such as: Synergistic Research, TELOS, Entreg, Nordost - QRT, Audio Magic -Blue Dot Eliminator, Signal Ground Solution or many DIY. Do they do what is claimed? Are they worth the $$ which are from a few hundred to many, many thousands! Which units have you tried/used and what were your results?