Has Anyone Ever Run TWO Identical Pairs of Speakers ?

Very bad idea. First of all you will only get an additional 3 dB out of it. Worse, you will permanently damage whatever imaging you have. You can split up woofers that way because the wavelengths they operate at are very long but, you can not do that with midranges and tweeters. At shorter wavelengths the speakers start speaking in two voices instead of one. Tweeters have to be no farther than 1/2 inch apart to speak in one voice up to 20 kHz. When you move them apart like you plan on doing you are listening to a choir instead of a single voice and you smear the image and detail. 

Fiesta, it is not theory. It is solid acoustic management. Yes, I have done it. I have two pair of Mirage speaker in my workshop. I got them in 1987 as stop gap speakers while I was waiting for my Apogee Divas to be made.  I tried stacking them one on top of the other with the top speakers upside down trying to get the tweeters as close together as possible. It went plenty loud. Low bass was missing and the imaging was vague. To get more midrange power a D'Appolito array is the best way to go if you have a strong enough tweeter. You could do a linear array of tweeters stacking small tweeters in a vertical line ala Pipe Dreams otherwise a single tweeter is always best which is why so many very expensive speakers do just that like Magico, Wilson and YG. This is my chief argument with Tekton speakers. Tweeter arrays like they use may get cheap tweeters to go loud but imaging goes right down the tubes. They might pay $2.50  for each one vs $300 to $400 for real tweeters. Real speaker designers are laughing their a---- off. You have already seen multiple Tekton buyers relating that they are very unhappy with the purchase. 

fiesta75, yes, it works great, in a disco.