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Have you tried adjusting the volume with the touch controls on your Noise Cancelling Headphones 700? If you're unsure, here are the buttons and touch controls for your headphones.
Let me know how you get on with this.
Jul 22, 2021
I have exactly the same issue. My Bose NC 700 worked perfectly in the past when connected by Bluetooth to my Samsung Smart TV. Now the volume is too low and the volume adjustment on the earpiece does not increase volume. Please help.