"As for the use of an isolated earth ground rod, that’s a no, no.
The purpose of the safety equipment ground is to provide a low resistive path for ground fault current to return to the source. Mother earth is not a low resistive path. If the earth is used as a path for ground fault current, and there is a ground fault event, the area around the earth driven ground rod works great for hunting fish worms.
The earth does not possess some magical mystical power that sucks nasties from an audio system".
THIS! It's REAL important! ALL grounds must return to the ground buss in the service panel.