In the USA, a single outlet is generally rated at 15 amps (1800W @ 120V), but the electrical code allows a circuit with more than one outlet on it to be breakered at 20A.. so they usually are breakered at 20A (2400W @ 120V). If you look at this wire size chart (
https://en.wikipedia.org/wiki/Americ...AWG_wire_sizes ) you can see that 14AWG is rated up to 15A, 12AWG is rated to 20A.. so basically you should be using a quality 12AWG cord for your initial connection between the outlet and your gear. Not only for safety, but because the smaller the cord (higher AWG), the more voltage drop you will get, which affects the performance of your gear. Amplifiers/Powered Speakers with switching power supplies in them will actually pull MORE amperage when there's lower voltage.. thereby making your situation worse so far as available amperage. So basically, using a heavier cord vs a lighter one is never a bad choice. 12AWG should be the default choice on a USA circuit, though 14 is ok for shorter cords (eg 25ft).
As far as how much power you need.. the old rule of thumb used to be that you need half as much input power as output.. if your subs are 1500W output each (3000 total), you need 1500W of wall power to drive them. So your idea that they should be on their own circuit is correct. And everything else is probably fine on another circuit. But with new gear using mostly digital amplifiers now, which are very efficient with power, you can get more sound out of less wall power. This past weekend I had my system at a festival and we ran my system, which is usually connected to TWO 30A circuits specially connected into a breaker panel, off a single 20A outlet on a generator, and we were able to get pretty loud with it. Not full bore but loud. So with your gear you can probably run off one outlet with no problems, not for a club style event but for let's say a smaller wedding you'd be fine.. so long as you are absolutely sure you are not sharing that circuit with anything else.
One thing to be aware of is the limit lights on your speakers/subs.. once they start blinking at all, if you increase the volume, your average power usage goes up significantly faster than it does below limiting.
So if you're in a situation where power is a problem, stay below limiting on your speakers.
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