The SoundLink III does not come with a subwoofer, could you please confirm what is happening so that I can assist you. All details, even small can help.
In the meantime, a reset may fix any issues, sometimes all we need is to refresh the system. We can do this by:
Press and hold the Mute button for 10 seconds, the LEDs will flash briefly
Press the Power button to turn the system back on
I look forward to your reply.
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