Dell AC511 - Connecting the Sound Bar; Connecting via Audio-in Port

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Connecting your sound bar
Use the audio in or aux-in jack to connect your audio device such as tablet or
smartphone to your Dell sound bar.
Audio-in port
You can play audio using the audio-in cable that came with your sound bar.
1 Connect the audio-in cable to the aux-in port on the left side of the
sound bar.
2 Connect the other end of the audio-in cable to your audio device.
3 Play music and adjust the volume as desired.
NOTE:
When audio in is the default playback device, the light
on the microphone button turns solid red. The sound bar
microphone cannot be used in this playback mode.