Two small mouths do not equal one big one unless they are right next to each other. You can make small modules where most of the cab front is mouth, and stack them. But separate them and you lose response and efficiency.
We built modded A-7's like that back in the 70's. Again, if you try to use a cab like that wide range your response graph is gonna have peaks and dips like the Himalayas. You can pick a wide peak and use it only at that frequency band...like 40-120 Hz. But as you go outside that band it will get peaky and dippy...
ANY...let me be emphatic...ANY rear loaded horn is gonna be anything but flat due to phase issues between front and rear paths. The design is only used these days as pro sound subs. Like the one I posted.
Wavelength of sound changes with frequency but the horn path length stays the same, so some frequencies will combine, some will cancel.
Designing cabs like that is very intensive, I couldn't do it. I might be able to take an existing design and by "cut and try" improve on it's performance.
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