I also picked up the JBL Soundgear. That has no issues with volume control, no matter what I pair it to. The Bose Soundwear, however, does not work with my TV or my Xbox One X into which I have plugged the transmitter that came with the JBL, via optical. And oh, that transmitter supports A2DP. I too am disappointed. Would have been nice if the box had said the Soundwear does not work with TVs and other devices. It only works with mobile phones. I think Bose skimped on costs by not using on onboard amp or whatever the JBL equivalent has that allows it to independantly adjust volume on the device itself.
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Facing the same problem, and have been visiting this thread every few days in the hope that Bose would have figured it out and posted a fix. I have the JBL Soundgear which came with a Bluetooth transmitter. Have connected the transmitter to the Xbox One X and volume control works fine when I pair it with the Soundgear. But when I pair the transmitter with the Bose Soundwear, I can no longer control the volume. And the default volume is too low to be of any use. So how is the Soundgear able to control volume while the Soundwear cannot? What special sauce has JBL used that Bose could not? I am suprised that the Bose engineers have dropped the ball on this one, and have not been able to fix the issue even months after it being reported. Using the Soundwear with TVs and even gaming consoles sounds like an obvious use-case for the device. So was it not tested for this? It might be rather convenient to pass the buck on to Bluetooth transmitters, but I believe the problem lies with the coding skills of devs at Bose. The exact same issue also plagues the Soundlink Revolve speakers. Please see this thread -- https://community.bose.com/t5/Bluetooth-Only-Speakers/Soundlink-Revolve-Volume-controls-not-working-with-Samsung-TV/td-p/102542
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