Originally Posted by RhinoBalls
Hello all, just bought the 4k Atmos Fire Stick. I have my soundbar that can decode DTS and DD attached to the TV via optical connection. Can I process DTS/DD/Atmos from the Stick (HDMI inserted) to the soundbar?
Still unsure what surround audio the TV provides via its optical out.
You won't get Atmos via optical. The only way possible would be to connect a receiver via HDMI 3 using ARC. Ideally you would connect the fire stick to your AV receiver, that will capture Atmos, and pass the picture to the TV.
The types of digital audio signals that can be transferred by a digital optical connection include two-channel stereo PCM, Dolby Digital/Dolby Digital EX, DTS Digital Surround, and DTS ES.
It is important to note that digital audio signals, such as 5.1/7.1 multi-channel PCM, Dolby Digital Plus, Dolby TrueHD, Dolby Atmos, DTS-HD Master Audio, DTS:X, and Auro 3D Audio cannot be transferred via Digital Optical connections - These formats require HDMI connections.
When the digital optical connection was developed, it was made to comply with the digital audio standards at the time (mainly 2-channel CD playback), which did not include 5.1/7.1 channel PCM, Dolby Digital Plus, Dolby TrueHD, Dolby Atmos, DTS-HD Master Audio, or DTS:X. In other words, digital optical cables do not have the bandwidth capacity to handle some of the newer home theater surround sound formats.