Vizio SB4021M-A1 SB4021M-A1 Quick Start Guide - Page 7

Be sure the TV port is an audio output

Page 7 highlights

USB Connect the Sound Bar to your TV using one of the connection types to the left. Choose the best possible connection type. Be sure the TV port is an audio output, not an audio input. 5

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5
Connect the Sound Bar to your TV using
one of the connection types to the left.
Choose the best possible connection
type.
Be sure the TV port is an audio output,
not an audio input.
USB