Grounding boxes which ones have YOU tried? And results?

I wanted to try the small Entreq, but Cable Company said it was special order only.  I ended up buying an Akiko ground stick with an RCA jack and I think it refines the sound to some degree.  They offer 90 day returns as I recall, so there's minimal risk. 

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).

I own the Entreq Silver Tellus that I bought used and I am very happy with it. I have tried the CAD, Nordost and a few others but the Entreq impressed me the most. Best I can say is the music sounds more grounded. Pun intended.
Seriously though, the music takes on a more fuller natural sound, that once heard you can’t do without it.

BTW, I also made some DIY versions that rival the Entreq. Although overall the final costs were about the same.

ozzy

I have some noise in one of my systems.  I asume ground, and I could take time to track it down ...  but are you implying that these might save me the trouble?  Ignorance here; I've never heard of these things and if you are just jerking me around, you win!!

I have found grounding boxes to clean up the music in all areas.

I started out with the Entreq boxes and then built my own version, I have 3 large boxes one each for amp, digital source grounding and the last one for chassis ground.

They work but take time to work optimally starting at 4 hrs, 12, 24 and 48 hrs .

HIGHLY RECOMMENDED

Grounding boxes are dumb AF.

@jdane - AFAIK, the ground boxes most of us are talking about are not meant to cure earth ground hum, which needs to be addressed separately through ground lifting or whatever. This thread is about what is referred to as "signal grounding", which I'm not sure even exists in engineering as separate from earth grounding.   Without getting into a debate, let me just say that some people believe that a separate ground box improves the sound, but I don't think it will cure hum. 

Chayro-- Thanks.    (Now I just have to determine what 'ground lifting' means!   But i believe it means-- get in there; don't electrocute yourself; and find out what the problem is the hard way.)

@jdane - ground lifting means buying an adaptor plug without a ground pin and sticking it on the end of one of the power cords until you find the one causing the hum.  It is not the optimum cure, but it is worth a try. 
https://www.amazon.com/Cable-Matters-Polarized-Grounding-Adapter/dp/B01M0FXMFK/ref=sr_1_3?crid=27L33...

I'll pass on these boxes too much money  not enough improvement.

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/

Chayro--Thanks.  I'll try it.