AC Power Question

@jea48 and @almarg are the experts on this subject. Hopefully one of them will join in.

They advised me when installing my dedicated lines. I'm running my analogue and digital on separate dedicated 20 amp circuits into separate Hubble duplex receptacles. In my case, I have a subpanel for my audio lines.

Both lines on the same leg with equal distribution of current draw from devices and appliances
to the sevice panel. 

@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.