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Don't know about that, but ...

It's clear measuring many high end players that they deliberately roll off high frequencies earlier than 22.05kHz.

On some players, I have measured a roll off as early as 12-15kHz and down -3dB at 18-20kHz.

Perhaps this is an attempt to "tame" the "harsh" sound of CDs, or a desire to have better overall filter performance.

But I would prefer a flatter response (I don't mind -1dB at 20kHz, that's what my current player does).

If the intent is to tame the harshness, then I would suggest a much better way of making CD high frequencies sound better is to reduce jitter (preferably down to the picoseconds, which is not possible on many players due to PLL).

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