Iplaynaked: "Unfortunately, the construction of the vast majority speakers is faulty BY INTENT as they cater to aesthetics and convenience rather than performance."Simple. Have you ever asked why reputable companies make all their speakers, except dedicated centers, as vertical arrays? Horizontal MTM arrays (and, in fact, almost all horizontal arrays) are faulty because the create irregular dispersion in the horizontal plane. (If you do not know why, Google a bit and find out about 'Venetian blind effect.') The reason they make horizontal MTMs for centers is, despite their knowledge of its faults, they have fed the public's misapprehension that centers should be horizontal. The only reasons for the horizontal arrangement are convenience, esthetics and/or ignorance. (I am not discounting the importance of convenience and esthetics but one should know the trade-offs before choosing.)
Faulty by Intent? Um whatever "faulty" means.
Note that some companies have changed their designs and all the new Paradigm 3way centers have the HF/MF arranged vertically. Note also that some companies, such as B&W, use the horizontal array for their less expensive models, like the HTM61 and HTM62, while reverting to proper design principles in their statement products, like the HTM7 and HTM1 through HTM4 models.
Kal