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RE: Ping The Conical Crew

Posted by Paul Eizik (A) on October 1, 2014 at 19:54:05

In Reply to: RE: EV Horns posted by ACMINC on September 30, 2014 at 17:06:09:

Ken

Take a look at the pic attached here, it's from Elements of Acoustical Engineering by Harry Ferdinand Olson (recently reprinted in paperback, in the public domain, and very highly recommended). Note that the slower expanding exponential horn has the best bass extension of the group, as it's more "pipe like" than the conical or parabolic. Conical horns quickly become unpractical for bass horns, but in the midrange where spacial considerations are less of problem they have now become contenders along with some oversizing/EQ "dirty tricks" (to paraphrase P.W. Klipsch).

It would be nice to have a rule of thumb for designing a conical mid horn (which is not really my dept.), and perhaps one of the conical guys will be attracted by the subject line here and step forward. In the mean time, an exponential horn (for example) is most efficient when the length of the horn is equal to 1/2 of a wavelength at the lowest target frequency, and the area of the circumference of the mouth is equal to 1 wavelength, where 13500/(Freq. in Hz.)= wavelength in inches. As should be obvious from the graph, you will have to oversize the conical horn considerably to get it to load the bass as well as the exponential horn, and/or use some EQ. You don't mention what you are intending using below the conical mid horn for the bass. If it's a direct radiator box woofer, then EQ may work as you will have to pad the 1823 down relatively to match the level of the woofer anyway. An exponential horn is a rather specific thing, going from the 1 inch or so mouth of the 1832 to the horn length and mouth area dictated by the sound waves, and following an exponential curve. However a conical horn just has to be cone shaped, and this could mean quite different things in practice. At any rate, some "cut and try/cowboy engineering/see what happens" is ahead for you.

Paul

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