@kingsleuy I used 12/3 Romex. There is not a 2nd neutral wire.
Using Amps = Watts/Volts
On one of the receptacles there is my main amp(max 500 watts) and the preamp(max 130 watts). This comes out to 5.3 amps.
Using Amps = Watts/Volts
On one of the receptacles there is my main amp(max 500 watts) and the preamp(max 130 watts). This comes out to 5.3 amps.