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Re: when horn expansion and mouth size exceed the 1/4 lambda

Not going to buy that one (by itself), Tom. That implies that for every possible radiation angle and every Fc for a given horn, there is also an optimum specific throat size, and that simply is not the case, because that depends on the characteristics of the driver.

The throat size of the horn dictates the characteristics of the response, such as overall efficiency, distortion, and band width.

That also misses the fact that its operating under increased acoustic impedance that defines the efficiency of a specific driver in a specific horn within the available characteristics of the driver and the "available" throat size.

Presumably, you are using the horn pathway length (and the resulting smaller throat size for a given Fc) as a means to increase the acoustic resistance "seen" by the driver. However, it leaves out the driver from consideration, which in turn, directly effects the throat size appropriate to the application.

There are also other ways to achieve the same goal of increased acoustic impedance without increasing horn length.

DM

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