Though HDMI can handle both audio and video in a single digital stream, you can opt where audio goes in a Mac via the Sound preference pane (or by holding down Option before clicking the speaker icon on the system menubar). You should adjust output volume on the TV or receiver and input value to find the right set of levels. Click the Input tab and use the slider to find the right balance between being audible to people on the call and avoiding distracting sound. If you choose to have the sound carried by your TV set or receiver, you can reduce feedback and echo by adjusting the input settings in the Sound preference pane. (Depending on the software, you may not be able to control output volume select within the app unless you switch system audio output to the same device and use the Sound preference pane to set the volume.) In Skype, select Skype > Audio & Video Settings and then choose an output option under Speakers. In Zoom, click the upward-pointing arrow next to the mic icon and select an output option. In FaceTime, choose the Video menu and then select an audio output option. You can also pick an audio output source in most of video chat software. But in macOS, you can use the Sound preference pane to choose the built-in speakers or headphone jack on your Mac. On an iPhone or iPad, you can’t separately control audio output. This can result in echoing and ever-louder feedback loops, depending on how loudly you have sound coming out of your speakers and where your input device’s mic is positioned. AirPlay passes the audio to the Apple TV by default.
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