AC Power Question

@mental , Before I had work done, i inquired on a thread and @jea48 participated with excellent instructions on the optimal setup of mains power to an audio system. @almarg joined the conversation and as always I valued his input.
After the installation of a subpanel hosting 2 dedicated lines on the same phase and an added ground rod, with Romex wired independently to separate Hubbell duplexes which are grounded back to the service panel. I came back to the thread to review with jea48.
Jea48 asked me specific questions regarding the hot, neutral, and ground. I actually called my electrician to get the correct facts, presented them to the forum, and was told it was done correctly.
It’s one of the best upgrades added to my system.

Same leg means same phase and you just caused an imbalance at the main panel.

The load from the audio lines is minimal. I asked the electrician to balance the load to both legs at the panel. He did a ampere calculation and moved some breakers to balance the current demand on the two legs; eg, refrigerator on leg A, air conditioner on leg B. Washer leg A, dryer leg B. Furnace 60A breaker shared, Subpanel 60A breaker shared.

2 phase panel 60A total.
60A subpanel.

Forget dedicated lines and simply get  Goal Zero Yeti lithium power station - anywhere from 1000w to 3000w depending on your needs.  The cleanest power.
No need for fancy conditioners, cables or anyting.
Simply 

https://solargenerator.guide/goalzero-3000-lithium-solar-generator-review/
An interesting product that I've only reciently heard about. I would be interested in reading some Audio reviews regarding it. Also interested in how many years the lithium batteries last and the replacement cost.

@lowrider ...I agree with you, he's a good source to have around. Haven't had time to thoroughly read some of what he posted and linked to last night, but I will.

@cleeds 

Will you please explain what "back-current" is? If you have a 14-3 cable, then each of the hot wires come from different legs of your service, correct? (After all, that's why they can share a neutral.) Please explain how a changing load on one leg can influence the voltage on the other leg.

If your 14-3 cable is connected to the same phase (leg) of your AC service, that's a code violation because of the shared neutral, no?

On a shared neutral such as 14/3, the back current is reverse flow from the red leg affecting the neutral potential for the black leg and vice-versa. That’s why shared neutral circuits sometimes use a smaller gauge neutral conductor. When both sides are steady loads, such as lighting, you can do shared neutral, but in the case of the circuit powering my clothes washer, the other leg powered a lighting circuit, which caused the lights to flare when the washing machine was changing cycles and electrical demand from it surged. 

Shared neutral circuits must never have both hot conductors on the same leg of breaker panel. That would cause the neutral load to reach double the current rating, and create fire hazard. Shared neutral should be against code in my opinion. The correct use for 14/3, 12/3, 10/3 etc... is 240 volt loads that require a neutral conductor, or sub panels.