Replace panel or add subpanel?

The LOL I take it refers to the derision and disregard for spending thousands unnecessarily on something that can’t possibly improve the sound. Like a new panel. When for a fraction of the cost of a new panel you could have the old one so much better it will be like a $10k system upgrade.

This is why I sound like a broken record. As long as people who haven’t the slightest clue keep posting their misleading nonsense its kind of incumbent on someone to set the record straight. So there you go.

Run one line to the system. Everything system goes on that line. Run whatever else for lights, room outlets, etc. Whether you do a sub panel or not is irrelevant. Spend more money if you want. The one line for the system however needs to come as direct to the system as possible. 

Be careful pingvin, that you're not taking advice from someone who has never wired even one panel, let alone a listening room. I've done panels, sub panels, and have hands-on experience comparing several different wiring methods in the same room. Experience that includes wiring for both 120V and 240V with a step down transformer. I'm unaware of anyone here who can match this level of experience. They do love to talk the talk though. As for me...

https://systems.audiogon.com/systems/8367

What you want is the one power cable to your system to be as short and direct to the utility line as possible. The rest of the room you can do however you like. Its that simple.