Clean ground

@pauly

When it comes to audio I’ll believe anything until proven otherwise.
https://www.auralthrillsaudio.com/battac.htm


As for a "Clean Ground".
I see you live in the NE. Assuming soil in your area is not excessively sandy and is black dirt and clay rod to soil resistance should be fairly low.

Installation:
Drive at least two 5/8" x 10ft copper clad ground rods into the earth at least 10ft apart from one another. Drive the rods at least 2ft minimum away from the house’s foundation wall. 3ft is even better. Drive rods 4" to 6" below grade if rods will be in a grassy area for mowing. Distance from foundation wall is for soil moisture created from rain fall that may be inhibited from roof soffit overhang. Use 5/8" ground rod clamps to connect ground wire size of your choice to the two rods. Run ground wire continuous from the inside of the house to the first rod and unbroken to the second rod. Dig trench 4" to 6" deep to bury ground wire and protect from possible damage.

Lightning protection....
IF it were me I would disconnect the ground wire from the active cabling during a lightning storm. Even a nearby lightning strike will travel through the earth and could travel up the ground rods and follow the ground wire into your home.
After you install your dedicated isolated grounding electrode system I would ABX listening using the isolated grounding electrode system to using the EGC (Equipment Grounding Conductor) from the wall outlet branch circuit. If you cannot hear a difference I would suggest you use the EGC.

Example of 5/8" ground rod clamp.
https://www.homedepot.com/p/RACO-5-8-in-Ground-Rod-Clamp-5-Pack-R22BAG5R/205843263

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@jea48 Thank you for the info. I wouldn’t have thought to use such long grounding rods.

Dear @pauly  : In all my system items only my phonolinepreamp is grounded and from this item is from where the audio signal goes to all other electronics items avoiding this way ground loops that always are noisy.

Now, years ago I decided to have a    true ground coming from the earth so a " technician " did it: he,  as @oldhvymec stated ,  took a 2m. copper rod in a hole in earth ( at around 2-3m deep. ) where previously he puts a combination of some " ingredients " as salt and the the rod gone there with the attached cooper cable and he close the hole and that cable is connected to my phonolinepreamp. That's it. Btw, that connection goes too at my dedicated electrical line where my system is fully regulated.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.