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?
rsf507
I have tried the Synergistic block with their HD power cord up grade and was very disappointed.
Pretty sure I have one of those in a box somewhere, along with a bunch of other stuff, just sitting there waiting for when I can find the time to hook it all up and listen.   

In the mean time, there are so many different things going on here I cannot even begin to tell you. 
The Gutwire grounding cables for individual components are another approach. I currently have Ultimates plugged into my DAC & pre, and they work well.

https://gutwire.com/products/ground-cable/