Sony SRS-X9 - Manual (Page 325)

Personal Audio System
SRS-X9
The controller cannot find the speaker. (The controller cannot browse the contents of the speaker.)
Make sure the wireless router/access point is turned on.
When the speaker is connected to a Wi-Fi network, place the wireless router/access point and the speaker closer
together and perform the setup again.
Make sure that the controller is connected to the home network.
Disable the multicast control on the wireless router/access point.
Notes on use
4-535-194-11(3)
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