Sony HT-A9 Help Manual page 109

Help Guide
Home Theatre System
HT-A9
Picture and sound of the device that is connected to the speaker system are not
output from the TV when the speaker system is not turned on.
Set [Setup] - [Advanced Settings] - [HDMI Settings] - [Control for HDMI] to [On] on the speaker system, and
then set [Standby Through] to [Auto] or [On].
Turn on the speaker system, and then switch the input for the device playing.
If connected to devices other than those manufactured by Sony that support the Control for HDMI function, set
[Setup] - [Advanced Settings] - [HDMI Settings] - [Standby Through] to [On].
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