Article ID : 00158792 / Last Modified : 03/02/2022Print

What do the colors and the flashing of the LED (On/standby indicator) on the subwoofer/surround speaker mean?

    • The LED on the subwoofer or surround speaker sometimes flashes.
    • Sound from the subwoofer or surround speaker sometimes has noise or audio dropout.




    [A]: On/standby indicator (HT-ST9)


    • Lit: Power is on. LINK active
    • Flashes slowly: Power is on. LINK connection in standby. (including when the signal has cut out)

    • Flashes quickly: The speaker may be broken. (ST9/NT3/RT5 only) Consult your nearest Sony dealer.


    • Lit: Power is on. SECURE LINK active
    • Flashes slowly: SECURE LINK connection in standby. (including when the signal has cut out)

    • Periodically flashes quickly: SECURE LINK being processed. Please wait for the connection to be established.


    • Lit: Power is off. (In standby)
    • Flashes: Temperature warning. Turn off the subwoofer and make sure that nothing is blocking the vent. Unplug the power cord (mains lead) from the wall outlet, and after the temperature has cooled, re-insert the power cord (mains lead) and turn on the power.

    Try the following when encountering an issue with wireless access point connection:

    • Move the subwoofer closer to the main unit of the home theater.
    • If possible, place the subwoofer where it is not directly blocked by any furniture, walls, or metal barriers.
    • Move your wireless access point (wireless router) more than 1 m away from the main unit, subwoofer, or sound speaker.
    • If the wireless access point (wireless router) that you use can switch between 2.4 GHz and 5 GHz frequency bands, try changing the frequency of the wireless access point to avoid interference.
      • For HT-ST9/ST5/NT3/RT5: Try changing the wireless router to the 2.4 GHz band
      • For HT-CT780/CT380/NT5/CT790/CT390/XF9000/X9000F: Try changing the wireless router to the 5 GHz band
    • When using a wireless access point (wireless router) that can fix the channel, change the channel setting of the router to a frequency band shown above and check if the issue will improve. If it has improved, fix that channel.


      • To change the wireless channel, refer to the operating instructions of the router.
      • If the setting procedure of the router is unclear, it is recommended to turn off the power of the router. The router may automatically select another channel when it turns back on.