I recently purchased the latest version of the Amazon Fire TV (2017, 4K HDR) and just realised that any track played by the Amazon Music and Spotify apps is streamed in Dolby Digital even if the content is stereo - which for music I would assume it's almost always the case.
The problem is that the stereo channels are only routed to the two front speakers. If the signal was sent as stereo, I could set the AV Receiver (Sony STR-DA2400ES) into Multi-Stereo mode and make use of all the speakers, including the subwoofer. But as the signal is recognised as proper Dolby Digital by the receiver, the Multi-Stereo mode has no effect.
The apps don't seem to have any setting to force the output to stereo.
If I completely disable Dolby Digital Plus in the Amazon Fire TV Audio settings, the audio goes out as stereo and the problem is sorted. However, in this way all video content via Netflix or Amazon Video is no longer played in Dolby Digital.
I am sure that I didn't have this problem with my previous Amazon Fire TV Stick (but I had severe video stuttering problems, hence the upgrade).
Will I forever have to manually toggle on or off the Dolby Digital settings of the Amazon Fire TV depending on whether I am watching movies or listening to music?!
Let's try following Sound troubleshooting Steps: 1. Set your sound settings to Dolby Digital Auto, Dolby Digital Off, Dolby Digital Optical, Dolby Digital HDMI, and see if the problem persists on all settings. Make sure that you clear the application data first, for whatever streaming app you are using (in your case we'll say Netflix and Amazon Video) in between each of these settings. 2. Make sure that there are no external speakers plugged into their television. If there are speakers present, try using the FireTV with the speakers unplugged (you may also need to disable some settings on your television if they were configured to work with the speakers). 3. check if you are getting sound in the device menus and retry.
If the issue persists write us back, on what happened during the trouble shooting or call our customer support for more in debt one on one trouble shooting of your issue.