Sharing ground wire between two dedicated circuits

@emergingsoul If you’re going to spend this kind of money for two dedicated circuits, why not just spend a tiny bit more for the best? If they are truly dedicated circuits, with dedicated circuit breakers, their grounds should both never intercept with each other, until they reach the circuit breaker box (aka load center). Instead of using Romex, go a step further, and use Aluminum Armor Clad for Healthcare Facilities (AC-HCF). It’s the absolute best choice for Isolated Ground A/V systems. The biggest benefit is that the average proximity of the hot conductor and the neutral conductor, with respect to the isolated equipment grounding conductor, is nearly equal, virtually eliminating ground voltage induction (GVI), even on long runs. If you go that (AC-HCF) route, I’d also use isolated ground outlets.

@emergingsoul 

You may find some of this information useful:

Power Distribution and Grounding for Audio

This is the most confusing thread I’ve ever read in my entire life. No wonder hi-fi interest is diminishing after reading all this.

Many audio-enthusiast’s, who previously didn’t know anything about audio equipment, and the interconnection between it, think that just by spending tens of thousands of dollars on the best audio equipment, should automatically make them know everything about AC power, audio equipment, and how to hook it up (and make them an audiophile). Not always the case.

There are simple answers to simple questions

Correct, but your questions are not simple ones, so they take some explaining. Yes, it can be frustrating for some.