Specifically, none of the MP3 encoding was done at 64 Kbps. At 64 Kbps, MP3 has only half the frequency response of CD music with the highs stopping just short of 11 Khz. The poor frequency range of MP3 at 64 Kbps makes it unsuitable for audiophile listening regardless of content. However, RealNetworks fails to provide any data to back up this claim. This means that individual packet losses do not result in audio loss greater than the length of the packet, currently a fraction of a second.
Any consumer can test stereo encoding performance.
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