I have a question concerning the effects caused by horn length. I'm visualizing a trumpet vs a tuba, but the frequency coming out of a horn would be determined by the crossover, I would think, and not the length of the horn.

Say we have two horns that will fit a common driver and both have equal dispersion, 60ºx60º, but one has a short throat while the other is long. What is the audio differences caused by throat length?

Thanks,
Hamilton