This technical discussion is probably only of interest to me, but it's actually a very important issue. The non-linear response I'm concerned about is between 500 Hz and 20 kHz, although mainly between 500 Hz and 10 kHz. The disparity in response between 500 Hz and 2.2 kHz is almost 15 dB. That's HUGE, and results in fairly drastic EQ'ing. If the speaker response really is that ragged (and I find it very difficult to believe a trusted manufacturer like this would produce a speaker like that), then I guess the equalization is called for. But if the the swings in amplitude are simply interaction effects between the speakers at the particular mic position, and the inherent response of the speaker is much smoother than that, then room equalization efforts like this are likely to produce very unreliable results. I always tell purchasers of my speakers to limit equalization to the bass region, where room effects really are important. Speaker designers don't measure two speakers at a time for this reason. If a single speaker measures well above the bass region (and I'm not just talking about on-axis response), then the speaker will sound accurate in the room, assuming there aren't gross problems. Bass room response is another story, of course. If you could humor me, I would be very interested to see how one of these speakers measures at the standard 1 meter distance. You don't have to show the graph, and you can just let me know privately what the results are. As a speaker designer interested in producing speaker that will sound right in most rooms, I really would like to know exactly what is going on in the graph you've show. Thanks!