You're welcome!
Varying degrees of.......simultaneously developing cinema sound systems for both large venues, recording studios and HTs for the wealthy made the pioneers of audio keenly, maddeningly aware of the various trade-offs one had to juggle to get an acceptable power response over some vertical and horizontal angle and why a fairly wide variety of sectoral and multi-cell horns were invented.
After all, what is a multi-cell but a bunch of tweeter horns ganged together and Rudy's tweeter arrays were just relatively inexpensive and very compact realizations using cone drivers: http://hifilit.com/hifilit/Bozak/brown-4.jpg
Later, he would switch to vertical arrays that McIntosh would continue to develop into 'infinite' arrays with the culmination being about the best overall performing speaker system I've ever been exposed to: McIntosh XR290 Speaker System
WRT Squeaks' staggered vertical array, RCA experimented with various length lines of differing angle 15" 'full-range' drivers on each side of a cinema screen (see attached) to try and improve on the extreme rising on axis response of the original Bell Labs/W.E. horn systems, but apparently it was inferior overall to them after they were upgraded with add on compression tweeter horn and large OB woofer systems, though that didn't stop B0$3 from doing the swivel two cube thing and making a bundle off it world-wide.
Anyway, like most things, you choose the layout, etc. that best meets the needs of the app and if the trade-offs in reality are too great, then re-think the design rather than crippling yourself from the get-go with some marketing 'conventional wisdom'/whatever, otherwise we all should only be listening through headphones.
GM
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