If you've ever bought or inherited an old sound system that doesn't have modern connectivity features like Bluetooth or HDMI, ...

All but one of our picks support at least the HDMI 2.1 standard, but keep your eyes peeled for HDMI 2.2 demands in the years to come. You might want a new cable for that, too.

Like coax cables, optical cables require periodic boosting of the signal, especially over TAT-8’s roughly 7,000 km length. Repeaters were spaced every 50 km or so along the cable, housed in long ...