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here is the correct reason...

it can be found in the latest Stereophile, in the review of the Ayre D1 DVD/CD player. The plot for the spectrum given the dithered 1 kHz signal is substantially identical to that of the Meridian 508.24. It rises to -108 dB at 10 kHz.

They say in the write-up that the noise floor in this graph is the same as the noise floor of the dither in the input signal.

That is your answer. This has nothing to do with noise shaping. They are inputting a signal with a rising noise floor, so that is what they are getting at their output.

This is why all the Stereophile graphs of this test output look pretty much the same.

Certainly, the noise shaper is not moving any signal energy. Nothing of the sort happens.


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