For many applications, the speed of digital communication is important. Most visibly, speed is about transferring large files as quickly as possible, or carrying enough data for an HD video. For USB audio (and for HDMI audio), speed is critical not because of how-much how-fast, but because time relationships within a digital stream are critical to the reconstruction of the analog wave formthat brings information, music and joy to our ears. Time-based damage (jitter) to this information within the data package makes the sound small and flat instead of 3D, harsh and foggy instead of smooth and clear.
Solid LGC (Long-Grain Copper) conductors eliminate inter-strand distortion.
Digital audio conductors controlled for direction.
Solid Polyethylene costs more than foam, but better ensures critical signal-pair geometry
While USB 2.0 and 3.0 are compatible, USB 3.0 is a dual-link system not used for USB Audio.