The reason is the same as with most speakers. While the direct on axis field can be made flat, there is no possible way short of adding additional drivers to compensate for the fact that sound reflected off other surfaces before you hear them will not be and in most rooms, this constitutes a lot of what you hear. After about 17 years of experimentation, I am more convinced than ever that there is no way to achieve perceived flat response without solving this problem first. This IMO is the underlying reason why many listeners prefer bi-polar speakers, move their speakers away from nearby reflective surfaces and apply sound absorbing material to those surfaces. It reduces some but not all of this reflected sound FR distortion. It's one approach but the more effective one IMO is to correct it for both its inherent FR distortions and those created by differential (frequency selective) reflections which reach the listener. In this way, radically different designs can converge to have similar perceived FRs.
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