Well, I've heard some high end setups, and they do sound "different" from the kind of everyday setups which I am familiar with.
But redbook CD techonology being what it is, it is by no means a cutting edge technology anymore. Even a $20 portable CD player can respectably play back a redbook CD.
It is true that you can use some really expensive DACs, to get higher fidelity analog sound. But how expensive can those DACs get? I know standalone DACs can cost thousands. But how much better are those standalone DACs compared to a respectable DAC found in a decent high end receiver? Not much I would guess.
As to the CD reading mechanism. That's just pure nonsense. Even the high end CD player manufacturers are switching to using computer grade CD ROM drives. No one makes dedicated audio CD reading mechanisms anymore.
I have always had the suspicion that those high end CD player manufacturers somehow tweak the sound, like using a built in EQ, so they actually do make their CD players sound different. So people who buy these ultra expensive CD players can somehow feel justfied in spending this much on a CD player. Anyway, that's just my suspicion.
As for myself, I'll never spend $1000 on a damned CD player.
