250-4k horn

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 Augusts wrote:

Julian, do you mean the sharp edge of the perimeter at the very end of the mouth or the not so sharp corners towards the end of the mouth?
I simulated the horn in hornresp, as far as it could be simulated. Have not got my head around akabak

Yes i mean the perimeter on the hornmouth. You have to keep in mind that all sudden changes in acoustical impedance (i.e. flarerate) will produce diffraction effects which can be interpreted as new point-like "sound-sources" which then will radiate omnidirectional and therefore also back into your horn, causing resonances.
Another thing to keep in mind is the big spike in groupdelay on the tuning frequency of a horn. In an optimal world you dont want to have this spike in the used range of the horn. At lower bass frequencies the groupdelay is less noticeable, but in the mid-range it can be problematic. So a really good midrange horn should be tuned ~1 Octave lower than the desired crossover frequency. But this leads to really big horns...there is a compromise to be found somewhere inbetween big enough and to small 

But on another note: you can listen to the advice of citizensc, he knows his stuff regarding horns and akabak ;)