Steren AMP-210CD Manual De Instrucciones página 48

When you want connect more of four speakers you can use 25, 70 or
100volts output from amplifier.
You'll need a line transformer.
Never touch stripped wires from amplifier's output, when they're in use,
may cause serious damages or electrical shock.
Replace the protector cover once you have finished the connection
process.
4. Connect the power cord to AC input and the opposite end to connect an
electrical contact.
RATED SUPPLY VOLTAGE:
120V-60Hz
21