Yes, 8K Ultra High Speed HDMI cable supports audio output.
A) Right-click the volume control icon on the bottom taskbar and click on "Playback Devices" to open the pop-up window for sound options. In the "Playback" tab, select "Digital Output Device" or "HDMI" as the default device, click "Set Default" and click "OK" to save the changes.
If your HDMI device isn't receiving audio
If your HDMI device isn't receiving audio from your Mac:
- Choose Apple menu > System Preferences, then click Sound. In the Output pane, make sure that your HDMI device is selected.
- If you're connecting using a Mini DisplayPort adapter, make sure that your Mac can send audio over Mini DisplayPort.
- If you're connecting from a Mac mini, unplug any audio device that is plugged into your computer's Audio-Out port.
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