Coconut-Audio tweeks

The tweaks he is making are a variation of a ground tweak which is rather popular in the DIY crowd.
Plenty of variations on the idea. (natually each person trying to SELL them claims some miracle. And charges for the miracle too)
So if you are interested, just take a bit of ANY wire, even a coathanger, and stick the thing on the negative terminal of your amp output. Do NOT let it touch anything else, just have the bit of wire, maybe 3 inches to 6 inches long, stick off the negative terminals only.
A LOT of variations on this idea. But some folks find it improves the sound.
I myself made some gizmos (very different, but same principle) to hang off the negative terminals of both negative ends of my speaker wires. Works for me. Another variation includes a battery, or is on the preamp connections. (like Coco boy's)
So, for free or nearly free, you to can become an audio nutcase, Why pay to be laughed at?

Let me put it this way. I don't want to call those alien rocks and seashells a scam. They might be magical and might very well work wonder. I don't know because I have never tried them.

But what I do know is for the price of a few of those rocks and seashells, I can have my room treated properly with bass traps, acoustic panels, and diffusers, which have been used by professionals all over the world for many years and with proven scientific research behind.

So between the two, I would treat the room first before using alien rocks and seashells.

Looks like a BIG JOKE!!

I picked up one of his products before the new year when they were being auctioned off for next to nothing - mostly just an throw away to see if they did anything at all. It does actually change the sound. It's more than noticeable in a blind A/B test. My preference for it varied greatly from song to song. At the current prices, you're probably much better off making a box the size of your components chassis out of masonite and 1x2's and filling it with quartz sand, metal shavings, or some mix of both. That would most likely also provide vibration damping in addition to EMI/RFI filtering. Essentially, yes they do something. No they're not worth the retail prices. If you don't want to put something together yourself and can find one of his products for <$40, it might very well be worth it. Greatest thing since sliced bread? No.