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Digital audio interconnects are essential for maintaining audio fidelity between components. This article explains key digital interfaces, including S/PDIF (coaxial and optical), AES/EBU, HDMI, HDMI I2S, USB, Thunderbolt, and Ethernet. Each type has distinct capabilities, advantages, and ideal use cases, from home hi-fi systems to professional audio studios. While optical S/PDIF resists electrical interference, coaxial supports higher resolution. USB and Thunderbolt offer high bandwidth for DACs, and AES/EBU is ideal for balanced, low-noise pro environments. HDMI I2S, though niche, delivers audiophile-grade performance. Choosing the right digital cable depends on your system’s needs, sound quality goals, and usage context.