Denon DVD-9000 Operating Lnstructions page 62

With DVDs containing multiple subtitle language signals, the subtitle language can be switched during playback.
During playback, press the SUBTITLE button.
0 The current subtitle language number is displayed.
cursor buttons to select the desired language
a The display turns off when the SUBTITLE button is pressed.
Remote control unit
Remote control unit
e If the desired language is not set after pressing the
cursor buttons several times, the disc does not include that language.
e The subtitle language set with the default settings (see page 23) is set when the power is turned on and when the disc is
replaced. If that language is not included on the disc, the disc's default language is set.
61 When the subtitle language is changed, several seconds may be required for the new language to appear.
e When a disc supporting the closed caption is played, the subtitle and the closed caption may overlap each other on the TV
monitor. In this case, turn the subtitle off.