I have a Roku Ultra 4670X. It plays all of the apps fine with audio with the exception of the HDHomeRun connect quatro. I get great video through the HDHomeRun CQ on my Sanyo tv but NO audio. I looked at the forums over on SiliconDust and they say it's a Roku issue with how it handles audio. Any help is appreciated.
It looks like TVs and projectors without the ability to decode Dolby Digital or AC3 audio over HDMI aren't supported: "To hear audio, you need a TV, AV receiver, or soundbar that can decode Dolby Digital or AC3 audio over HDMI. Most modern TVs can do this, though we’ve noticed a few Samsung TVs cannot." https://info.hdhomerun.com/info/roku