Onkyo TX-NR535 - Checking the Input Source

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Using the Listening Modes
Checking the Input Source
You can check the audio format of the input signals. While
audio from the player is being input, press DISPLAY on the
remote controller several times to switch the information
shown on the main unit display. If "Dolby D 5.1" is displayed
in Signal format, the Dolby Digital 5.1 ch signals are being
input.