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Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

RE: I have never measured a CD that has peaks beyond 0db.....but

I'm not sure how you are measuring the CDs, you would have to oversample it to see the "real" peaks, some ripping software will tell you if there are "overs". That is what inter-sample peak means, the samples on the CD are not the actual peak values except at low frequencies. At high frequencies, the sample point can be quite a ways off from the peak. The digital and analog reconstruction filters will of course restore the peaks if they have the headroom, though the problem is seldom with the analog section. For best sounding results, CD mastering engineers should set the peak level using an oversample filter to pick up the real peaks, but they often don't.



Edits: 01/31/17

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