Samsung PN51D490A1DXZA - Manual (Page 75)

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English
■ Speaker Settings
● Speaker Select ( External Speaker / TV Speaker ): A sound echo may occur
due to a difference in decoding speed between the main speaker and the audio
receiver. In this case, set the TV to
External Speaker .
N
When Speaker Select is set to External Speaker , the volume and MUTE
buttons will not operate and the sound settings will be limited.
N When Speaker Select is set to External Speaker .
● TV Speaker : Off , External Speaker : On