Steren AMP-210SD Manual De Instrucciones página 25

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.
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