usccompeng
New member
I plugged the Firestick into my Atmos-compatible Pioneer VSX-LX503 and did the set-up. The Firestick detected the Pioneer (through CEC?) and Atmos just worked without making any changes to the configuration. Then I took that Firestick, and without making any changes, plugged it into my Denon AVR-3312CI. It showed DD+ 5.1.
Based on my experience, it's possible that if you factory reset your Firestick, set it up with your buddy's Atmos receiver, and then take it back to your house without changing any settings, it may work. Keep in mind I didn't change a single setting, not even the wifi because it was all in the same house. From my side the test would be to Factory reset my Firestick and set it up on the Denon and show it doesn't work, but I hope you understand why I won't do that
Based on some reading on the TidalDL forums, Tidal determines your equipment when your device handshakes, and sends one of three files: stereo FLAC (for PCs), AC-4 mp4 (for Android phones), or E-AC-3 mp4 (for Apple TV, Firestick, and TVs connected to an Atmos AVR). Seems kind of crazy to me that the Firestick/Apple TV would determine whether you have an Atmos-capable device and then send that info to Tidal, but I guess they are trying to keep the E-AC-3 files from getting distributed to insecure devices.
Thank you very much for the detailed explanation! Out of curiosity, I tried one more thing which was connecting an HDMI cable to my USB-C connector on my Samsung GS20 Ultra, because it actually says "Dolby Atmos" because the phone supposedly supports it and on the Tidal app it displays "Dolby Atmos" instead of "Hifi" or "Master" when trying to play those files. I hoped that maybe the raw output from the phone would be a 5.1 DD+ compatible bitstream, but I was again disappointed to see that it was just 2.0. In this case, I know the phone is getting an Atmos compatible file, but I think it must decode and downmix everything before passing it along to its HDMI packetizer. I wish there was a way to get the raw audio data directly to the USB-C/HDMI port.