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You need to decide what length of the horn you can afford. When I mean “afford” I ment the position of the horn in context of the rest of your system. You know the lowest cut off - 40Hz. So, the most suitable for you length and the mouth size will give you the throat diameter. If you have unlimited space in your room then be advised that starting form some point the increase of length and minimization of the throat will increase loading but also will introduces some unwanted colorations. You see, the longer horn is them more “parallel” it is. A horn that we use for audio have very slow opening at beginning and in very long horn the “beginning of the horn” section is very long, it might be a foot or two of virtually parallel walls. For the frequencies that the 40Hz horn will be caring the “virtually parallel walls” are the essentially the parallel walls.  I have no idea when it becomes a factor but too long horns tend to be congested and colored.

So, you have a horn, you have a throat diameter, then you need to find a driver. To decide on a driver is very complicated ceremony and my absolute rule is following in it: “It is absolutely imposable to predict with a serenity how a driver will sound after it will be loaded in a given horn.” You might do for compression driver, or for conventional driver, in fact any driver that you will be using with back chamber will become a compression driver.   The section of driver is a big subject… Linearity is not something that I would even care; do not think about it as you have no control over it anyhow. I laugh when people talk about linearization of bass horn frequency response.

Where are you? A well-sounding 40Hz horn is very interning accomplishment to experience. If you are near US’ New England and if you listen serious music then I would like to be invited after you finish the projects.

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