Onkyo TX-L20D Manuel D'instructions page 28

> Before Start > Part Names
How to Check Listening Modes and Other
Information
Press (a) repeatedly to switch the display of the main
unit in order of:
Input source & volume
Listening mode
Signal format
The display changes few
seconds later.
Sampling frequency
Input signal resolution
> Install > Initial Setup > Playback
Advanced Setup | Firmware Update | Others
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