Perhaps there's something here to explain a few things.

Now, these devices have received pretty much universal acclaim for improving the sound of any CDP and they take the analog output of a CDP as their input.  They also claim to do nothing in the 0 to 35kHz band, just some "proprietary processing" in the 35kHz to 120kHz (well beyond audible) band to "align ghost images with the main signal".

First of all, I'd love to know what they're actually doing, secondly, it seems pretty extraordinay that something processing the audio signal from a CDP could somehow improve the accuracy of it, afterall, it has know way of knowing what was actually on the disc.  By any rational argument the Whest DAP10 must be reducing accuracy since it can't possibly "know" the ways in which any given CDP is deviating from accuracy.  My guess is that it's just an expensive tone control.  However, if so many people like what it does it begs the question of whether measured accuracy is subjectively preferable and if not, why not?

Michael.