A 1" compression driver would have actually worked well, and in fact, that's what I use in the eight π speaker. Its horn creates the right directivity for matching with the tweeter; Without it, the crossover point would have to be made higher for matching the Alpha 10 as a direct radiator. But when I thought about it, I already have two very good matched-directivity two-way speakers, the three π and four π loudspeakers. I prefered to keep the one π and two π speakers simple and low cost. In the end, the DX25 stood out, pretty much alone in my choices.