Inside of cabinet, front left corner.  Note the 3-position switch I added to the power input box to control the utility outlet.  The 100W amp for the subwoofer plugs in here and the switch is set to slave the outlet to the game's main power switch; when power is off, the utility outlet is off and when the power is on, so is the outlet.  Power to the outlet can also be constant or cut off with the switch.