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In the Forum: Horn-Loaded Speakers
In the Thread: Problems with horns: upper bass
Post Subject: Re: Bass Horns and Tractrix vs. other Curves Posted by Romy the Cat on: 3/25/2005

 Kerry Brown wrote:
Yesterday a friend of mine brought over a CLIO analyzer and we graphed the impedance vs. frequency. I was surprised that the subhorn measures like a ported box tuned to 50 Hz !
Yes, this all is very explainable. The Bruce’s woofer is basically 40-45hz horn and he seized the 30Hz driver via a back chamber to make the primary resonance probably ~45Hz. Then he most likely introduced a fake 25-30Hz curve in the end of exponent and heavily electrically EQ the horn. I believe it has electrically EQed +20dB at 20Hz or something like this…
 Kerry Brown wrote:
We also measured the impedance response of my 100 Hz straight horns. Even though they are too short and the throat is too big, they DO measure like horns. No double hump.
Hm, I wonder how the measurement of impedance would make it “measured like horns”? :-)
 Kerry Brown wrote:
I will forward the graphs if you like ( after my friend emails them to me ). 
If you like then post it right here. The posting interface has an ability to upload the pictures. It would be fun to see. However, in order to understand how these horns work it would also necessary to know the respose of thier drivers in infinite baffle and thier horn-loaded repose.

The Cat

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