Which is better in terms of sound a Sony CD changer that has 4 or 8 times oversampling filter or one that has high density linear converter?

Sony's previous technology was 4- or 8-times oversampling. Their newest thing (as of '07) is the High Density Linear Converter (HDLC). It starts with 64-times oversampling, and does a couple of other nice things, too, and has an overall simpler circuit (which usually helps), so it should be an improvement over straight 8-times. Caveat: I have not actually heard it side by side. But Sony's track record with digital audio quality is Excellent (the rootkit debacle notwithstanding), so I would expect it to be a real though subtle improvement.