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Re: How do you design a horn for a compresion driver?

Posted by John Sheerin (A) on February 22, 2005 at 19:09:22

In Reply to: How do you design a horn for a compresion driver? posted by Roger Hill on February 22, 2005 at 10:11:14:

Hornresp will not be much use for a typical high frequency horn design. It will predict the power response which is not the same thing as on-axis response which is what most people are concerned with. In most bass horns, the size of the horn is too small to greatly influence the horn's polar pattern, so what hornresp shows for low frequencies will be pretty much what you get on-axis.

For high frequency horns, the horn is usually large compared the wavelengths you're reproducing, so the horn will effect the polar response, causing the power response to be different than the on-axis response (depending on the design).

The typical approach, I think, is to pick a horn ideology and go from there. Iow, do you want to try for low throat distortion and good polar response? Okay, go conical and realize you will have to correct the frequency response in the crossover. Or go for something like a tractrix horn or better yet a LeCleach horn for low internal and mouth reflections, better low frequency / flatter onaxis response.

In an ideal world, your horn would provide a rho*c load over the bandwidth you wanted to use it in, same as a plane wave tube, and the only thing you would have to consider would be the plane wave tube response and the polar pattern of the horn / driver combination. But unfortunately nobody seems to measure PWT response anymore, and most people have a hard time figuring out a polar pattern and how it will influence the SPL at some given point.

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