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In the Forum: Horn-Loaded Speakers
In the Thread: The best 20 hz bass horn
Post Subject: Excursion vs. equalizationPosted by Romy the Cat on: 8/29/2010
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 Horn Savant wrote:
I then tested the two 416's in free air and they were 28 HZ each. Then I tested them in the horn - both drivers driven with signal and measured 23 HZ resonance. Better throat coupling - better than, say, a Shearer or Mirrophonic folded stacked "W". But, like these, probably more of a "waveguide" than true well coupled exponential loading.

Yes, you are absolutely correct. It looks like your bass horn is more direct radiator then horn loading, I intentionally do not use phrase "waveguide" as I do not understand this concept. With horns everything is very smile there are only 3 parameters that defile horn: profile, throat size and dB equalization at mouth frequency. It looks like your horn has insufficient amount of air in the horn bell for a given throat size. There is nothing wrong in it but if your divers move from 28HZ in free air to 23HZ loaded then the bottom knee of your useable range is managed by excursion of the driver, not by the horn equalization.

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