Grounding with a Earth box?

@cakyol,
Incorrect.
Ground lifting and grounding boxes are two different things.

Though I am not versed as to how the other manufacturers connect their equipment, I do know that the CAD unit uses an unused input to connect to the grounding box. This essentially grounds the equipment's circuit, not just the chassis.
B

The Nordost grounding box makes a huge difference, really & I mean VERY noticeably cleaning up the sound (the extent of which surprised me, I didn’t go in open-minded) - but they make no claims to stuffing it full of minerals etc. Used can be had for biggish discounts. There are 3 units in 2 ads on AG at this moment. I wouldn’t buy anything stuffed with minerals unless I heard it, especially side by side with a Nordost. I trust my aural memory enough that unless I heard a huge improvement w/o a comparison, it’s (very) unlikely to be as good.

Best ground box you can get, package of dillies and a 6 pack.

I require Hallographs (pair behind speakers and pair at rear of room) despite my high end custom listening room. My speakers are not SOTA or close to it (Legacy Focus) and require help in focusing imaging, soundstaging and frequency eveness. The Hallographs tune the acoustics making these speakers adequate for my use without purchasing big bucks speakers I’m looking at ($35K to $60K). My future speakers may not require Hallographs and probably won’t need speakers' SR HFTs either (the speakers I’m entertaining have multiple bass and treble controls built-in). I haven’t tried grounding boxes. It won’t hurt to try.

@millercarbon Nice explanation of RFI and grounding conditions affecting equipment/cabling.

The CAD grounding box range is considered the best in class by many in the industry. Stereophile gave it a 2020 award after a couple of their staff found great results, including the often hard-to-please Michael Fremer:

https://www.stereophile.com/content/stereophiles-products-2020-accessory-year

Scott Berry, the electronic engineer who designed it, gives a 10 page explanation of the way it works here:
http://www.computeraudiodesign.com/CAD_Ground_Control.pdf


I would urge people to try these CAD ground control units. The differences are very evident. I had a home demo and ended up buying two the effects were that good.