The saying 'classics never die' seldom applies to electronic cables. While staples like figure-8 cords and kettle leads endure, video and USB cables evolve quickly for superior quality and speed.
Audio cables are an exception—formats like 3.5mm jacks and S/PDIF optical persist in modern gear. But with options available, should you choose analog, digital S/PDIF, or HDMI? We'll break down each format based on real-world performance to guide your decision.
Analog 3.5mm/AUX carries audio as electrical signals over copper wires, ideal for simple stereo but prone to noise over distance and lacking native surround sound.
Digital S/PDIF optical (TOSLINK), by contrast, sends sound data as light pulses through fiber optic cables—no copper involved. Think of it like HDMI video versus old VGA: digital precision over analog.
The big win for S/PDIF? 5.1 surround sound and Dolby formats like True Surround and Digital. Without a dedicated PC sound card, it passes encoded audio to your receiver for immersive playback you'd otherwise miss.
Coaxial S/PDIF uses RCA connectors for digital signals, more common in AV receivers than PCs. It supports up to 192kHz bandwidth versus optical's 96kHz—though benefits at extreme highs are debatable.
HDMI reigns supreme for audio, powering hi-res video too. It handles lossless formats like Dolby TrueHD, DTS-HD Master Audio (Blu-ray standards), Dolby Digital Plus, and Dolby Atmos (now streaming on Netflix).
Highest bandwidth enables 7.1 surround versus S/PDIF's 5.1. It transmits uncompressed digital audio at up to 192kHz—eight channels via HDMI 1.4, 32 via 2.0.
HDMI ARC (Audio Return Channel) on TVs connects receivers/soundbars for all-source audio over one cable, controlled via CEC remote tech.
ARC caveat: limited lossless support (no Atmos/TrueHD); upcoming eARC unlocks full potential. Pro tip: HDMI cables are plentiful in most homes.
If your setup offers optical S/PDIF and HDMI, go HDMI every time. It's as reliable as digital audio but more capable, pointing toward a future of unified cabling across devices.
