Probably not worth arguing about, but if you look at the -10 degree curve, the HT is down about 3 dB at 20 kHz, and the BMR is down about 6 dB. I know from my own measurements that when you make measurements with just the tweeter operating, the AMT has much broader vertical dispersion. I'm not certain why the audioholics + and - measurements are so different. It's probably a baffle effect. In any event the various dips in the 3K region have nothing to do with dispersion--those are due to adjacent driver interference effects.