Grounding cable gauge size

A ground cable is used for safety. It does not affect the sound unless your system is miswired.

It should be rated at the equivalent or greater current level which would blow the main fuse of your specific device. To be sure, let us say at twice the level. For most purposes and for devices connected to a 15 amp mains, it is not necessary to have a ground cable thicker than about 10 AWG, unless you somehow intend to bypass your fuse (I know there are some fuse lovers on this thread) and run your device as a blast furnace.

Paying any thing over a few dollars for it is just plain .........

@bugredmachine i agree with your comment above on auditory improvement on a ground…UNTIL I plugged my speakers into the ground box. Gobsmacking sound improvement. Better than spending thousands of $’s on component upgrades…My ears tell me the truth!

@cakyol i guess these grounding connections to a ground box solved my speaker’s grounding issues.  Loving it!   Amp and DAC don’t seem to benefit from the box's.  Crazy stuff…

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You probably had a ground loop which you eliminated by plugging it into a star connnection. 

I was speaking to the HF NS 1260 compound. Yes, reducing noise is auditory but the compound should not be needed for this activity.