Hyundai H-CMMD4043 - Manual (Page 45)

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Language
OSD: choose the desired language for the System Menu.
DVD Audio: choose the desired language for DVD playback.
DVD Subtitle: choose the desired language for DVD subtitles.
Disk Menu: select the desired language for DVD Menu.
Audio
DRC: set the DRC (dynamic range control) for better playback for low
volume playback: On (use bass to play the more dynamical audio), Off
(normal playback).
Chanel: choose either 4CH Mode or 4.1CH Mode to make the subwoofer
output closed or opened.
Sub.W Phase: choose either 0º or 180º to set the subwoofer IN or OUT
phase.
Sub Filter: choose the subwoofer channel frequency according to the
acoustic surroundings of your car and your preferences.