Good for you, but keep in my mind rooms can isolate you from family as most likely others in the home have little to no interest.
In reference to power, Audience makes an in wall OFC 10 AWG cable you may want to consider from the breaker to the outlet, I have not done this but plan to. And consider Audio grade outlets.
Having a dedicated circuit for Audio is the best route, but having separate circuits supporting multi outlets may introduce the infamous ground loop. Your system will not come close to 20 amps being somewhere around 3-5 amps leaving plenty of head room.
Perhaps others can chime in on this.
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