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I wanted to include a bit about this in the article, actually! It ended up getting edited down to the point of unrecognizability, but initially I was talking about notch filters and Wien bridge oscillators.The issue was/is that old analogue THD meters had no way of separating the THD and the noise from the residual after the notched out fundamental. So much of the single 'THD' figures in the past, were really THD+N figures. Now of course, it's trivial with computer based FFT to measure the harmonics alone.
We're blessed to live in an era where such refined signal generation and analysis can be done so easily.
One can only assume that is why many other measurements are conducted and posted in ASR measurement reviews.
Would that assumption hold, however? What measurements, bar frequency response, are we typically inferring sound quality from?
Let me be clear, I'm not averse to measurements being done which have poor or no correlation with audibility in and of itself, but why are we ranking audio devices using that metric?I think it suits the purpose of a metric for ranking products tested in a graph format.