On a normal audio CD you're getting worse fidelity. It must be dedicating some of the low bits to encoding this crap if it's to remain compatible with standard audio CD players.

Keith Johnson is a GRAMMY-nominated recording engineer who also coauthored several patents covering optical disc technology that are the basis of today's video discs and digital audio CDs.
Johnson cofounded Gauss Electrophysics where he invented the technology used throughout the industry that allows high-speed, high-quality duplication of prerecorded audio tapes.
The RIAA must love his invention!