My intent for the crossover would be your existing midhorn/HF application, and not for GP. I was simply wondering if the HF horn's frontal position (above, below, either side, or inside) were important as long as the depth ratio between drivers were preserved? (I already had some intuition that summing was involved.) And, if another compression driver were used (like a B&C, for instance), might any conjugate or compensative filters differ?