Some points:
- Response outside one’s hearing range is irrelevant. Banging on about it is a red herring. It is the real in-band accuracy that I am interested in, not what some ‘golden ears’ 20yo can hear. You brought this aspect up, so stop wasting your own time.
- One conversion does not a song destroy! But 10,000,000 calculations can.
- Bob Katz also states in his book that digital filter design seems to be the first thing to suffer in cheaper equipment. But his is not really the key real issue for DAW users. It is the effect of lots of processing beyond a single conversion.
Of course, the actual calculations on the digital side are far more involved than any simple explanations can cover.
I have also covered much of this on the Soundsonline forums, and it was quite clear from those that there are a lot of misconceptions, especially about the Nyquist Theorem.
What I find most interesting is that the human body uses a more digital system than we use in our DAWs, and that we are only trying to fly below the body’s reality threshold.