Record the output path that changed
A Mac connected to a home-cinema receiver and the same Mac used alone at a desk have different sound paths. If the setup changes, note the selected output device and the relevant app preference before altering the programme’s language or restarting the network. A sound problem after disconnecting an HDMI receiver should be described with that change in context.
Apply Apple’s hardware-specific explanation
Apple says passthrough sends the original encoded audio bitstream over HDMI and supports specified Dolby formats. Its guide scopes the feature to Apple silicon Macs with a built-in HDMI port or supported adapter. For a compatible receiver, Apple says to enable passthrough and select the HDMI output; for built-in speakers, it says to turn passthrough off. The TV-app Playback setting is therefore not a universal “better audio” switch.
Compare the intended listening setup
For example, after moving a laptop from the receiver to its own speakers, check the output choice and passthrough preference together. Return to a short familiar passage and verify ordinary sound on the intended speakers. If the receiver remains in use, record its supported format rather than assuming an HDMI connector alone establishes Dolby Atmos capability. Keep volume moderate while comparing outputs.
Keep the diagnosis separate from soundtrack selection
Selecting a different language or an audio-description track addresses programme content, while passthrough concerns delivery to external equipment. Change the output arrangement deliberately before testing another track, so you can tell which change mattered. If support is needed, provide the Mac type, connection route, receiver model and exact preference without claiming that every device in the chain was tested.
Questions, answered
Should passthrough stay enabled for built-in Mac speakers?
Apple’s guidance says to turn it off when using the built-in speakers.