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Steve_B wrote: Meanwhile, back with the ported horn.....
Consider collapsing the mouth of the horn down so that it is a simple tube. Drilling a hole in the side of the tube and connecting a chamber to it with a short pipe will create an acoustic notch filter. Moving away from the resonant frequency the attenuation reduces to zero. As I said before, if the port is to increase efficiency below the operating range of the horn, it, the horn, won't increase the gain of the sound radiating from the port. It will to some extent alter the tuning of the port so conventional calculations used for tuning may be wrong.