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 form that 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.
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