Powering On: 
You will be able to unlock the box of the mixer
if you know the 4-digit code.
The mixer must be turned on first (before the speakers) 
and turned off last (after the speakers).
The reason for this is that you will hear a loud pop in the
speakers if turned on in the wrong order, potentially
causing damage to them.
Make sure the speaker switch is turned “OFF” on the 
switch panel before turning on the mixer.
The switch panel can be found on the wall near the
mixed nuts register and four outside doors.
The “ON” switch is on the back of the mixer 
The speakers are located on the beams above each bathroom.
The light switch located on the wall closest to the 4 outside doors, will allow you to switch on the speakers.
So remember to make sure the mixer is turned ON before you turn ON the speakers, and that the speakers are turned OFF before turning OFF the mixer!