Merely pointing out why there is a need to optimise digital beyond getting good readings from the easy, obvious measurement tools - I've been listening to unpleasant sound from vast numbers of systems set up by others for decades, which motivates me to get rid of the artifacts from my own gear. These issues are not intrinsic to digital, in the theoretical sense - they result from poor implementation. This is easy to prove, for myself, because I start with grubby, mid-fi sound - miles from anything decent - and steadily evolve it to a quality which allows it to be run at maximum volume, for any length of time, with complete ease in the listening. So, what's happened? I do nothing to the FR, or change key components, or electronic active parts, like transistors - I simply identify all the shortcuts, and bypass all the junk areas, strengthen the ability of the system to reject interference from any source. In the conventional measurement sense nothing whatsoever worthwhile has been done - yet the subjective difference, and improvement is enormous.
The fact that what I do is so hard to measure in terms of showing a numerical difference, is exactly why the audio industry is caught in a vortex of lack of understanding, and a chaos of thinking reigns ...
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