Ground 'box' what's in them?

Snake oil and the owner was caught before putting a generic USB cable into their own custom made sleeve and jacking up the price by 20x.Same as these grounding box.A few metal wires and some metal plates and the so call "cocktail" of black magic sand (probably  Tourmaline powder) sandwiched into a high school quality box and selling it for $1000+.My neighbor build custom cabinets for a living and I shown him the photo of the box and he laughed saying his 10 year can make a box way better than theirs.

Re-reading this old thread and I realize how much my opinion has changed on the subject of grounding.

Today, I have a Entreq box and several of my DIY versions, and I have to say they have greatly increased my listening enjoyment.

Best I can say, is they reduce the grunge that rides along the AC grounds.

ozzy

I don’t know a mini black hole designed to suck the money from your wallet ?