RCA 1512786B User Manual page 37

Tour of the TV
AUDIO OUTPUT Provides variable-controlled or fixed-level
stereo audio output.
Variable output is ideal when connecting the TV to an
amplifier that does not have its own volume control or
remote control.
Fixed output is ideal when connecting to an A/V receiver or
amplifier that has its own remote control.
You can choose the type of audio output by selecting the Audio
Output & Speakers control panel in the Audio menu.
To connect an amplified subwoofer to
the TV, use the left (L) AUDIO OUTPUT
jack.
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