The new headphone jack features “DC load detection and adaptive voltage output Your Mac can detect the impedance of the connected device and will adapt its output for low and high-impedance headphones, as well as for line-level audio devices,” reads Apple’s support page. With that in mind, if you work with high-res audio, it’s definitely worth paying attention to. One feature that flew under the radar during Apple’s MacBook Pro (2020) event was the upgrade to its headphone jack.