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A mix of conctrete and steel skeleton is a very good mixture, particularly for the upperbass horn. BTW, go not be “disappointed” that you did not go for Tractrix. The Tractrix has many advantages but for the range where you operate I hardly see any advantages (besides the fact that Tractrix is shorter) that would be important. Also, the finishing of this thing is important. The smooth, shiny and sexy is not necessary better...

As I understood, since you said that it was “not a measured response” you did not actually experienced the sonic benefit of the upperbass horn phase plug but you rather projected them theoretically? If so, then I might propose that when you actually listen the plugged horns then you “might” not find the upperbass phase plugs as a worthy idea. Well, the phase might or might not do something for widening the horn’s radiation - I feel it is irrelevant. What I believe is relevant is that a phase plug greatly extend HF response and it is NOT desirable for this type of the horns, not to mention that your driver has too heavy diaphragm to handle MF at more or less acceptable level quality. Perhaps I’m wrong and it all will be depending from the quality of the MF driver that you will me mating the upperbass horns with …

BTW, how many times did you accidentally hit those horn’s corners with your hips?

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