Yamaha DSP-A970 - Manual (Page 12)

1-2. SETUP
Before you start making connections make sure all related electronic components are turned OFF.
REAR PANEL
CAUTION: TO PREVENT ELECTRIC SHOCK, DO NOT USE THIS
(POLARIZED) PLUG WITH AN EXTENSION CORD, RECEPTACLE OR
OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED
TO PREVENT BLADE EXPOSURE.
10
(General Model)