Have been using the 4k stick for a while now everything was working fine till now,but facing audio problem now other than netflix & movies on amazon prime the audio is only in stereo mode even for amazon music,spotify etc.The moment videos on amazon are played or starting netflix the audio goes into surround mode but the moment I go back to the home page it is back to stereo mode.
Surprisingly, music these days is only in 2-channel stereo. Stupid, eh? Back in my day <grabbing my walker> we had stuff like quadrophonic sound... 4 channels! I don't know anyone who had something to get the benefit of that, but we had it! (this was back in the 70's.) https://en.wikipedia.org/wiki/Quadraphonic_sound
I'm not sure how they handle music in movies (theaters/DVDs/Blu-ray), whether they bother to re-kajigger the originals to give fancy multi-channel sound. Considering how much they spend on movies, I'd assume they would if they could secure the rights to the original recordings.
I was just discussing this with another poster. At least as far as Showtime's app is concerned, the Fire TV 4K doesn't give 5.1 surround sound when plugged into a receiver. I emailed them and they said there was no timetable on 5.1 sound for the streaming app. "At this time, there have been no announcements about a release date to make the app available with Dolby Digital 5.1."
If you plug the Fire TV into the HDMI port on your TV and run an optical cable to your receiver, no problemo! Makes no sense to me.
Maybe the other streaming apps are similar although, as you point out, Prime Video works fine. Not sure about Netflix since I cancelled it, but I THOUGHT it worked.
If your Fire TV device is connected to an A/V receiver, make sure the receiver is on. Select Settings, Display & Sounds, Audio from the Fire TV menu, and make sure Dolby Digital Plus is set to OFF bluestacks.onl.
The Fire tv stick is connected to the A/V receiver & in audio settings it is has been on best audio available till date & working fine till now. Maybe the latest update has broken something,will a reset work.
What you are seeing is normal. Only a few sites have surround sound.
That being said, maybe you THOUGHT you had surround sound because you selected one of the pseudo surround sound options on your receiver. My Yamaha has a bunch of those that take plain stereo and modify it to play through all of the speakers. I don't personally think any of the are worth a damn, but that's just me.
And even if a site DOES have surround sound, most of the time you can't even tell. I suspect directors don't care much for the sound aspect.