“Do the onboard speakers mute when using an HDMI ARC for Audio device to enable headphone use ?”
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Hello helden159. The internal speaker of the LG 55 Inch Class UQ7570 PUJ series LED 4K UHD Smart webOS 22 TV, Model # 55UQ7570PUJ and a Bluetooth speaker can be used to output the sound at the same time. Up to two Bluetooth devices of the same model can be connected. Audio is played through the TV’s built-in speakers and the audio device connected to the digital optical audio output port simultaneously. You cannot play audio at the same time through the TV's internal speakers when you are outputting audio through the TV's HDMI eARC port. The TV's optical digital output and HDMI eARC will be deactivated when streaming audio to Bluetooth headphones or speaker. The Bluetooth audio output's volume is variable, so volume of your Bluetooth speaker will need to be controlled by both the TV and the Bluetooth speaker for adequate volume level...^Ivan
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