Onkyo TX-NR545, Manual

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1
Center speaker, surround speakers or height speakers need to be
installed.
PURE AUDIO button (on the main unit only) (European, Australian
and Asian models)
The display and analog video circuit are turned off to switch the unit to Pure
Audio mode (European, Australian and Asian models) which provides purer
sound. Selecting this mode lights the PURE AUDIO indicator on the unit.
Pressing the button again reselects the previous listening mode.
Selecting Pure Audio for listening mode turns off the display and analog
video circuitry, but the video signals input through HDMI input are output
from HDMI output.