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3D SURROUND: The audio out is virtual surround sounds (only for 5.1CH player). OFF: Turn off DOWNMIX function. If playing 5.1CH discs or the unit is connected with 5.1 channel amplifier, this item should be selected (only for 5.1CH player). FRONT, CENTER, REAR and SUB-WOOFER SPEAKER: (No this item in 2CH player) If your speaker system includes the above speakers, you can set these items according the real speaker status. DIALOG: The DIALOG mode is available, and you can press up and down