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Is the Optical Cable Dying? (cnet.com)
Geoffrey Morrison from CNET explains how the optical cable is "dying a very slow death": The official term for optical audio cable is "Toslink," short for Toshiba Link. Developed in the early '80s to connect their CD players to their receivers, it was a red laser optical version of the Sony/Phillips "Digital Interconnect Format" aka S/PDIF standard. You've seen standard S/PDIF connections a bunch too; they're often called "coax digital." Optical had certain benefits over copper cables, but they were also more fragile, and for a long time, more expensive. Though glass cables were available, for even more money, most optical cables were made from cheap plastic. This limited their range to in-room use, primarily. Through the '90s and 2000's, the optical cable was near-ubiquitous: The easiest way to get Dolby Digital and DTS from your cable/satellite box, TiVo, or DVD player to your receiver. Even in the early days of HDMI, right next to it would be the lowly optical cable, ready in case someone's receiver didn't accept HDMI. But now more and more gear are dropping optical. It's gone completely on the latest Roku and Apple TV 4K, for example. It's also disappeared from many smaller TVs, though it lingers on in larger ones, a potentially redundant backup to HDMI with ARC. The reason for this? Soundbars...
Digital optical is utterly inferior to HDMI Audio. It only supports 2 channels uncompressed, anything other than that. 2.1, 5.1, 7.1 is compressed.
From Wikipedia: https://en.wikipedia.org/wiki/...
Unlike HDMI, TOSLINK does not have the bandwidth to carry the lossless versions of Dolby TrueHD, DTS-HD Master Audio, or more than two channels of PCM audio.
HDMI supports uncompressed audio, 2.1, 5.1, 7.1 or even greater.
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Erm the coax connector is digital, in fact the exact same digital data as optical.
Coax noise affecting the digital signal? Not Gonna happen.