Sennheiser M3AEBTXL Instruction Manual page 28

Setting up the headphones as the default audio output device for your Mac/PC/mobile device
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Make sure that the headphones are connected to the Mac/PC/mobile device using the USB cable.
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From the Systems Preferences or Control Panel of your Mac/PC/mobile device, select
"MOMENTUM 3" as the default audio device.
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Start music playback from the Mac/PC/mobile device.
The music is played through the headphones.
Storing and transporting the headphones
To keep the headphones in good condition and to avoid nicks and scratches, always store the
headphones in the carry case when not in use or when carrying them around.
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