I remembering talking about compression ratio. The corner horn is a cube one based on your idea of conical corner horn. I have been using these corner horns for the past ten years. The cubic shape is the reason I have to build the midrange horn on my own. I will keep the inner dimensions but will have to make it such that the midrange horn aesthetically "compatible" with the square corner horn.
Wayne, do you sell DE 250 compression drivers separate from your kits? I will need to get the crossovers, the tweeter horns, and the compression drivers.