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In the Forum:
Horn-Loaded Speakers
In the Thread:
Crossover or non-crossover help need.
Post Subject:
Re: Crossover or non-crossover help need.
Posted by
Greg B
on: 1/4/2005
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Hey Romy,
One rather simple acoustic solution would be to use a quarter wave stub. This is about the closest acoustic analog to an electrical notch filter. I believe JBL used this trick in their 'Aquarius' speaker to remove a peak in the response. Simply make a tube from cardboard or PVC pipe with one end open, stuff with fiberglass (or whatever), and mount in the horn like a phase plug. 13560/4/(length in inches) will give you the center frequency. Something like karlson type slits cut into the open end should lower Q to whatever is desired - think tulip.
If you visit a model/hobby shop, they may still sell model rocket nosecones, which would make it easy to create an official looking phase plug.
I don't know how well this would work, but it would be an easy enough experiment. I'm not a big fan of electrical notch filters either, except sometimes to smooth the impedance peak in HF units.
Good job on your website.
Greg B
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