Audio Return Channel; Auto Lipsync; Sleep Timer; Power Management - Onkyo TX-NR545 Manual

Listening mode cannot be changed while "Audio TV Out" is set to
"On" and audio is being output through the speakers of the TV.
Depending on your TV set or input signal of the component, audio
may not output through the speakers of the TV even if this setting is
set to "On". In such case, audio is output from the speakers of the
unit.
If you operate the MASTER VOLUME control on the unit when
"Audio TV Out" or "HDMI CEC (RIHD)" is "On" and audio is output
from the TV speakers, audio will be output from the unit. If you do
not want to output audio from the unit, change the unit or TV
settings, or reduce the volume of the unit.
Audio Return Channel
Default Value: Auto
You can enjoy sound of the HDMI connected ARC compatible TV
through the speakers connected to the unit. To use this function, set
"HDMI CEC (RIHD)" to "On" in advance.
"Auto": When enjoying the TV sound through the speakers connected
to the unit
"Off": When not using the ARC function
Auto LipSync
Default Value: On
This setting automatically corrects any desynchronization between the
video and audio signals based on data from the HDMI LipSync
compatible TV.
"On": Automatic correction will be enabled.
"Off": Automatic correction will be disabled.
Power Management
Sleep Timer
Default Value: Off
Select to turn the unit into standby mode automatically when the
specified time elapses. Select a value between "10 min" to "90 min".
"Off": Select if you do not want the unit to automatically switch to
standby.
Auto Standby
Default Value: On/Off
This setting places the unit on standby automatically after 20 minutes of
inactivity without any video or audio input.