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Re: What are the consequences of a non-optimal throat transition in a horn?

Posted by Paul Eizik (A) on March 20, 2007 at 10:20:52

In Reply to: Re: What are the consequences of a non-optimal throat transition in a horn? posted by PK on March 19, 2007 at 23:54:12:

Peter

From the pics of the BMS 4592ND I found on the web, it's difficult to figure out how they made the transition from the tweeter to the 2" midrange diaphram. There does'nt seen like there is enough room to bring this off in a 2" driver. A discontinuity in this area would be a cause for concern and could be the cause of the sibilance you note. If you could identify the center of the resonance with a test microphone, you might try tuning it out with a passive filter (zobel), however if it's a complex series of peaks and dips, this approach would have limited sucess. You don't mention if the horn is one of the BMS horns for this driver or one you have constructed. You might try smoothing out discontinuities in the horn with modeling clay. One of the disadvantages of the exponential horn in the midrange is it's abrupt termination at the mouth. You could try smoothing this out. Someone posted some experiments on the Lansing Heritage Forum where they attached some rolled up towels around the mouth of a conical horn, which improved the response. Do a search for the post "Factors Affecting Sonic Quality of Mid & HF Horns & Waveguides" over there.

Hope this helps.

Paul

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