Vivitek LCD-TV - Manual (Page 17)

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English
2. Audio
Bass, Treble & Balance
The Bass, Treble and Balance sub-menu adjusts the ranges of high and low sound
frequencies as well as the audio balance levels for left and right speaker output.
Analog Preference
The Analog Preference sub-menu sets the audio output mode to the desired listening
preference. The available modes are Mono (single stream), Stereo (left and right stream)
and SAP (Secondary Audio Programming such as a foreign language track).