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AirPlay devices/speakers
OwnTone will discover the AirPlay devices available on your network. For devices that are password-protected, the device's AirPlay name and password must be given in the configuration file. See the sample configuration file for the syntax.
If your Apple TV requires device verification (always required by Apple TV4 with tvOS 10.2) then you can do that through Settings > Remotes & Outputs in the web interface: Select the device and then enter the PIN that the Apple TV displays.
If your speaker is silent when you start playback, and there is no obvious error message in the log, you can try disabling ipv6 in the config. Some speakers announce that they support ipv6, but for some reason don't work with OwnTone.
If the speaker becomes unselected when you start playback, and you in the log see "ANNOUNCE request failed in session startup: 400 Bad Request", then try the Apple Home app > Allow Speakers & TV Access > Anyone On the Same Network (or Everyone).