"I'd say that looks pretty damn good. The reason his on-axis measurements looks the way it does (climbs slightly from upper bass to the crossover region and then tapers off slowly) is due to him optimizing the power response and not the on-axis response."
i agree but the horn is too small for the driver. he should have a nominal 15" horn in there. one of the seos might improve things, drop the crossover point, hold pattern control, and lower the crossover region.