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jessie.dazzle wrote:

Assuming one will not get anything under 50Hz (usable) from a 40Hz horn, I interpret the mission of lower-bass channels in the context of a horn system as follows….

Hm, this is a bit tricky with bass. A playback might not have anything usable less than 50Hz but it is not necessary mean the lower bass section needs to be started from 50Hz and do down. This is the whole idea of the lower bass section that it might very much would need to be let say low-passed at 30hz with second order and to be enough to load the room properly. I don’t think that those things the might be recognized without actual trying, listening and measuring in a very specific room.

jessie.dazzle wrote:

Driver size: For sound below 35Hz, in the context of an all horn system, I do not subscribe to the multiple, smaller-diameter drivers approach. My reasoning (certainly open to debate) is as follows: The multiple, smaller-diameter drivers appraoch, if it is really to produce sound of useful amplitude below 35Hz, would likely requre a ported enclosure. Some of the gain in quality associated with the smaller drivers would be sacrificed in the interest of quantity (amplitude); a difference likely rendered more perceptible in the presence of mid-bass horns. If there is no requirement for sound below 35Hz, the multiple, smaller-diameter drivers appraoch might be better. After having lived with it, I would not want to go without the 18-36Hz octave.

Well, the multiple smaller-diameter drivers are good as they allow creating cylindrical waveform of line array. Again, what smaller-diameter drivers we are talking about? I use 10” but they have free air resonance of 19Hz. Not any of 18” drivers have such a low resonance. Still, if a channel is crossed relatively low then I would also probably prefer a single large driver instead of multiple drivers, or course only in sealed or infinite baffle. I however, do not make any presumption about the type of the enclosure. The enclosure I have in mind would be 40-50 sq feet at least and two of them is HIGE space. Where they would be and how they would interact with room is totally unknown. Make it portable on while in my view is unnecessary as moving such of enclosures no one will, or at least I would like not to. They need to be built to order for the very specific space of the house and to sit there. Where this “very specific space of the house” might be I do not know yet in my house, so I do not know what shape of the lower bass enclosure I would needed. I am not rich enough to make this project multiple times.

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