Dedicated 20 amp circuit. 10/2 or 10/3?

Thinking many of you are not in US, with mention of 220v/240v, I’m located in US … I have been planning, in process of redoing, movie/listening location with a single 20A/120V for three amplifiers (MC303; MC152; Mi254) and two subwoofers (JL F113) … You guys got me all worried thinking that one dedicated 20 amp is not enough. I don’t know how many people notice that most power conditioners, Panamax/McIntosh MPC500 max out at 15A …

Are you all plugging into outlets directly with your components? McIntosh MPC1500 is 20A …

maybe in my case it would be better if I bought two MPC500s used one for regular amplifiers and second one for the two subs? This way, I could justify wiring two different “dedicated” circuits (beyond normal plugs) into the room.

Oh, in the US, 12/2 for 20A regardless of 120V or 240V.

I am pretty sure my electrician used #10 B and W, but #8 green to earth ground in PVC instead of Romex.

@ mnenasci    best layout I have seen of a power panel in a long time

mnenasci    Dedicated circuits is a great idea. I have five 30 amp circuits for amps and two circuits for low power, 20 amp. The low power is a 30 amp sub panel fed through a larger Sola isolation transformer.

Upstairs has less than that.