Bose 3-2-1 GSX SERIES III Owner's Manual page 27

SETUP
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Insert the red and white plugs at the other end of
this cable into the AUDIO IN TV connectors on the
media center.
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Use your TV remote control to turn the TV speakers
down to minimum volume.
J
White plug
Red plug
This prevents the echo effect of audio playing
through both the TV speakers and your 3,2,1 ®
system speakers.
Be sure to match red to red and white to white.
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