Rockville RXD-F20, Manual

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4 CHANNEL AMP WITH 2 CHANNEL INPUT
If your head unit has one pair of Left and Right RCA out put jacks, plug them in to RCA input Jacks 1 and 2 of the amplifier and set the input model switch to the 2CH
position.
The amplifier preamp circuit will automatically mix the signals to channels 3 and 4 thereby preserving your Left and Right Balance control but with no Fade control
Front to Rear.