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I am not sure about the tv, have not tried this. But, I know that FireTV itself, as in the separate devices hooked into the tv - do not have a mechanism to control headphone volume. I tried and nearly blew out my ears - it was so loud - and found at this time that is not supported. So, not sure about the tv.
Sorry, there was a problem. Please try again later.You can use the included remote to adjust the volume. When you connect an external audio device into the 3.5 mm headphone jack, the TV speakers should automatically turn Off.
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