Oct 12, 2017
Sep 25, 2014
Curiously have you tried to clear the pairing list on the SoundLink Bluetooth III by pressing and holding the Bluetooth button for 10+ seconds? You should hear a tone when this is done, do you hear that tone? If so, can you try to re-pair the Bluetooth device and re-test?
Also, did you perform the reboot by pressing and holding the Mute button on the top of the speaker for a full 10 seconds, until all of the LED's begin to blink?
Lastly, have you attempted to pair multiple different Bluetooth devices to the system, and still received the same issue?
The microUSB port on the back of the speaker would only be for service and updates and does not have audio capabilities.
Let us know the answers to the questions above and we can take it from there! Thanks!