Re 2020 Roku Ultra - Dolby Atmos is DECODED in the Ultra, not passed-through. Device-based Dolby audio decoding is a requirement for NetFlix Atmos (NF's requirement), so in order to support Dolby Atmos on NetFlix this was a necessity, especially given the Dolby Vision support (it would be silly for NF on the Roku to have DV support but not DA Thereis ZERO DIFFERENCE in audio quality between DTS-HD Master Audio and Dolby TrueHD because they are both LOSSLESS formats. Either one will produce a bit-for-bit copy of the original audio track that was encoded once they are decoded. Any difference you are hearing is just a coincidence of the way the movies were mixed. DolbyDigital Plus is a multi-channel audio format developed jointly by Dolby Laboratories and Sony. Initially, it was called "Dolby AC-3" (AC-3 being the type of stereophonic sound it accommodates) but changed its name in April 2012 to reflect the inclusion of additional features compared to AC-3. HDMIARC is a better option. It supports Dolby Digital Plus, Dolby Atmos, and up to 7.1 channels of uncompressed audio while Digital Optical only supports Dolby Digital and up to 5.1 channels of uncompressed audio. HDMI ARC also offers features like CEC in which your TV remote can control the volume levels of a connected soundbar or A/V receiver. .

dolby digital plus vs dolby atmos which is better