Ok, so keeping the flare angle and final area teh same as the original design (this is for the mid-horn on the pi-7, btw) is important, but I may loose some pattern control with the narrower horizontal dimension. Is that correct? Hmmm...its all about compromises, isn't it? There is no free ride.So if I've got this right, I would probably loose some stereo imaging with a square horn rather than a rectangular horn.