Sony HT-A9 Help Manual page 128

Help Guide
Home Theatre System
HT-A9
Pairing cannot be achieved.
Bring this speaker system and the BLUETOOTH headphones closer together.
Make sure this speaker system is not receiving interference from a wireless LAN device, other 2.4 GHz wireless
devices, or a microwave oven. If a device that generates electromagnetic radiation is nearby, move the device away
from this speaker system.
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