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Hi, I built such PA cabinets a few months ago. I used an existing design I adapted to my speakers. I can show you how it is like with some photos. I used 2x12 inches midrange speakers in a long throw angled cabinet with a horn tweeter on top for mid high and a bullet tweeter for the highest frequencies. This last tweeter is lined with the horn tweeter to match response phase and is intalled in the 12th horn to keep space. There is a 2nd order 3 way passive filter inside and I cut down to 120Hz before the cab with an active filter to stick the big 21 subs. The result is amazing, very sensitive without the need for max power and flat response up to 18KHz+. The only thing is the horn angle that's quite directive and is mostly useful with large, see outer spaces, unless you add more front fills to cover short distance audience. As a probing test, I am planning to build two more cabs like this, but with a single 12 because the double cabs are a bit heavy, and dynamic is so gorgeous that a single 12 will just make it fine. check out the look of these cabs on a raw test during construction (no active filtering, player straight in the epx3000, the horns did not have the bullet tweeter at that time, I added later to retreive the highest range: http://www.dailymotion.com/video/xge51e_chateau-3-voies-brut-de-fonderie_tech. construction is not that complicated as there are only a few angles to manufacture, the rest is much like a standard cabinet.
 

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There's a garage......LOL.

No there aren't any active treatments behind the speakers.
These cabinets are interesting, but I think it is a bit delicate to build with this curvy horn, this is why I chose a simpler version. can you post a link to the some schematics? how is the 12 mounted? I guess it is rear mounted with a phase inversion? thanks for sharing your experiences.
 
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