Quote:
Originally posted by gedlee
HOM - Higher Order Mode, its a term that I coined to define waves that propagate in a waveguide that do not go down the axis, but travel by bouncing off of the walls. They are not predicted by the Horn Equation, so most people didn't even know that they existed (I was the first person to hypothesize there existance). The Waveguide Theory predicts them, and low and behold, it turns out that they are quite significant to audibility. Minimizing them yields a far better sound quality. But with "horns" its not possible to minimize them because you don't know what to do - the equations aren't rigorous enough to predict them so they are simply ignored.
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So a HOM is simply a sound wave that has reflected inside the horn or waveguide, right? When using a foam plug on my waveguides, I noticed that the reproduction sounded more articulate. For example, I was able to discern words in songs that I hadn't noticed before. My hypothesis is that the reflected waves muddy the articulation due to the time difference between the initial wave and it's reflections.
Imagine a good pair of headphones, and you get the general idea. Diffraction is a bad thing kids.
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