The first Google TV Streamer update lets you manually choose an audio output formatYou'll want to update your Google TV Steamer to pick a custom audio output format.
Source: The first Google TV Streamer update lets you manually choose an audio output format (https://www.androidcentral.com/streaming-tv/the-first-google-tv-streamer-update-lets-you-manually-choose-an-audio-output-format)