Some TVs can be limited to PCM stereo audio passthrough, while others will support DTS/DD/DD+ surround. However, most HDMI ARC features are entirely optional, so implementation of said features will vary widely from brand to brand, or even from one generation to another. It can be pushed to transmit Dolby Digital Plus (eAC3) and even Atmos over eAC3 (not to be confused with Atmos over Dolby TrueHD) streams but that requires an extension introduced in 2016 called Common Mode that is not strictly part of the base specification and must be actively supported by both the TV and AV receiver. At base level, its bandwidth of 1Mb/s allows HDMI ARC to deliver stereo audio and compressed 5.1 surround. Compared to legacy optical cables, the flexibility of the HDMI standard allows additional audio formats to be transmitted over ARC but bandwidth is still very limited.
HDMI ARC (Audio Return Channel) allows for "upstream" and "downstream" signals over a single HDMI connection between two ARC-capable A/V devices.
Optical is limited to “vanilla” Dolby Digital and DTS, as it does not have the bandwidth to carry more advanced codecs like Dolby Digital Plus/EAC3, lossless audio codecs such as Dolby TrueHD, DTS-HD Master Audio, or more than two channels of PCM audio.ĭTS, AC3, PCM 2.0 / eAC3 + Atmos optional Optical cables (also known as S/PDIF or TOSLINK) can carry digital audio streams to an AV receiver/soundbar that can decode two channels of uncompressed lossless PCM audio or compressed 5.1 surround sound. IMPORTANT: a TVs built-in decoding capabilities are not to be confused with the TV audio passthrough capabilities (optical, ARC, eARC, RCA) However, Shield should have no trouble to detect those, and that will have very little to no impact about the actual sound quality anyway, so don't worry about it too much just be aware that this is normal to see if you check the Shield available audio output formats. To be noted: even though they might only have 2 speakers and thus, will only support stereo, recent TVs will often have built-in basic DTS/AC3/eAC3 decoding capabilities.
Two speakers, stereo setup pretty straightforward. Let's take a look at the different possible setups.
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