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RE: How large is too large for HE?

At around 350 Hz, a 15 inch driver becomes beamy and higher up radiates a series of lobes and nulls but at the point (lower in frequency) the where edge to edge multiple radiators are about ¼ wavelength apart, they stop exhibiting mutual coupling and the increase in efficiency that results from that. There is an upper practical limit of about 25% efficiency for multiple direct radiators (about 106dB 1w).

Same for the effect of a boundary or fractional space, once the distance is ¼ wavelength, there is no gain but instead a reflection which causes a cancellation notch.
My objective is to build something with very high sensitivity that radiates as a single source in time and space over the entire bandwidth, without phase shift from a crossover, without lobes and nulls caused by multiple sources and I think I see a way to do this with a horn.
I can do all this now BUT the sensitivity is about 6 dB lower and the system is much heavier, more costly and more powerful than needed for the home and Tubes.
The issue is then how large is too large.
Best,
Tom

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