A very nice technical evaluation too, with responses shown at various angles from the tweeter reference. Somewhere around 25 degree off tweeter H axis and at tweeter height seems to be optimum.
For those with a tech interest, the peculiarities noted in the vertical plane are due to the crossover design, which achieves phase coherence mechanically instead of electrically; The tweeter is advanced by 0.5 wavelengths at the XO frequency. Listening at 25-30 off-axis, and at tweeter height, corrects the amplitude alignment, so this must be the designed listening axis. The suck-out above tweeter axis does have the effect of correcting the power response peak at that frequency, which is a consequence of a large diameter mid driver handing over to a small tweeter with a large beamwidth. That's a good thing in lively rooms.
The small dip around 2kHz is the only negative consequence and is relatively minor. From experience it can make the speaker sound a little laid back in the presence region, but such a characteristic is preferred by most listeners anyway, and especially so with classical music.
Last edited by Art Vandelay; 11-14-2017 at 01:22 AM.
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