Onkyo SBT-A500 Instruction Manual page 39

> Before Start > Part Names
Dialog Control: You can increase the dialog portion of the
audio in 1 dB steps up to 6 dB so that you can make dialog
easier to hear over background noise.
0 This cannot be set for content other than DTS:X.
0 The effect may not be selectable with some content.
Dialog Enhancement: You can increase the dialog portion
of the audio so that you can make dialog easier to hear over
background noise.
0 This cannot be set for DTS:X playback.
> Install > Initial Setup > Playback
Advanced Setup | Firmware Update | Others
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