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I doubt it has anything to do with the fact that they are low quality mp3's. Yes lower bitrates affect the sound, but I wouldn't go as far as to say they add audible distortion.
I think what you are hearing is more likely the effect of distortion that sometimes occurs when cutting vinyl rather hot. It happens on high frequency sibiliant types of sounds such as esses etc in vocals. You hear it all the time on club records because they push the levels hard to get a loud cut.
Most accapellas you're grabbing are probably rips from vinyl. I don't think it's very common to find accapellas on CD these days. It's more a DJ thing hence on wax.
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