Comb filtering would happen in a pretty high frequency for these guys, since 3fe22 is not very big. And the angle that would happen would have been pretty big. Plus the speakers are not true point source. You probably might be able to hear it if you put in a pure tone something like 10kHz, move your up and down... I doubt you can hear it in normal music.
Oon
Oon
Not in the horizontalUneven response in the high frequencies in both horizontal and vertical position.
Loss of efficiency in the high frequencies.