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Using this unit as a power amplifier
When connecting a pre-amplifier and using this unit as a power amplifier, switch the input source of this unit to “PWR AMP”.
Turn the INPUT selector on the main unit to switch the input source to “PWR AMP”.
“PWR AMP” is displayed on the display.
When the input source is “PWR AMP”, adjustment of the volume, balance and tone has no effect. Adjust these adjustments on the pre-amplifier.
When the remote control code setting is set to “AMP1” (Default), INPUT 
on the remote control cannot be used to switch the input source to “PWR AMP” or switch from “PWR AMP” to another input source. To make remote control operations, change the remote control code setting to “AMP2” or “AMP3”. link
NOTE
When the input source is “PWR AMP”, the main unit outputs at maximum volume. Check the output level on the input device before playing it and adjust the volume accordingly.