Sony HT-A9 Help Manual page 127

Help Guide
Home Theatre System
HT-A9
Sound of the connected BLUETOOTH mobile device is not output from the speaker
system.
Make sure that [BT] appears in the front panel display.
Bring this speaker system and the BLUETOOTH device closer together.
If a device that generates electromagnetic radiation, such as a wireless LAN device, other BLUETOOTH devices, or
a microwave oven is nearby, move the device away from this speaker system.
Remove any obstacle between this speaker system and the BLUETOOTH device or move this speaker system away
from the obstacle.
Reposition the connected BLUETOOTH device.
Switch the wireless LAN frequency of any nearby wireless LAN router or PC to the 5 GHz range.
Increase the volume on the connected BLUETOOTH device.
Related Topic
Listening to Music by Pairing the Mobile Device That Is Connected for the First Time
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