About basshorn simulations, it's not that I would trust them "blindly", rather it is my informed opinion that the simulations track reality very closely. I think that's probably what you meant, but it is important to be aware this isn't blind faith. I've done a lot of simulations and I've measured a lot of horns, built as specificed by the models. Under about 500Hz (depending on the cone), the models are very accurate. At higher frequencies, cone flex prevents the models from being accurate because the models assume pistonic diaphragm motion.