I think we do have to interpret the article as part objective commentary, part political prose aimed at not upsetting companies whose speakers don't measure particularly well in the Canadian tests. I pretty much agree with his comments on harmonic distortion. We really don't know how the THD results translate into audible behavior. But if we restrict yourselves to the frequency plots, and just ask whether they can reliably predict the spectral balance that we hear in a room, I think the answer is yes. Just about every speaker I've measured sounded that way in terms of balance. And you don't need a complete set of measurements taken at virtually every angle to predict what you hear. In my experience, off-axis behavior, and in particular extreme off-axis behavior, is dominated by more direct sound. That's what I hear, and that's what you see when you look at measurements with long gate times that show a mixture of on and off-axis arrivals. Although real-life rooms don't look like echo-free test chambers, once you get above the bass and mid-bass regions, room reflections do less than you might think to the basic character of a speaker. None of this goes to directly to sound staging and imaging, although I suspect that the better a speaker measures, the better it will do in these respects.