44Basic operationThis audio equipment supports Dolby Digital (5.1 ch), DTS (5.1 ch), LPCM,SDDS and Dolby Pro Logic. This enables enjoyment of rich theater sound,even in a limited space, when playing a video that has been recorded withone of these technologies.ch (channels)...number of audio output sources that can be simultaneouslyplayed.ATTENTIONCenter speaker with power amplifier and subwoofer with power amplifier(sold separately) are required for playing audio sound with Dolby Digital(5.1 ch) or DTS (5.1 ch).[SOUND]ButtonAdjusting the surround systemSwitches to Sound Adjustment ScreenPage 2.Touch the touch switch.2 NEXTSwitches to Sound Adjustment ScreenPage 1.Press the [SOUND] panel button.1