There aren't any AFAIK, for the excellent reason, as Dave said, that there's not exactly any such thing. 'Dallas III' was a smoothed out Dallas II that one DIYer built -somebody evidently coined the term, but it was never one Ron employed. If you want to create one, smooth out Dallas II like the above, and you're there. Be aware though that the main result of this will be to improve efficiency at the top of the horn's operating BW, which isn't necessarily such a good idea. Lower down, the wavelengths are too long to be especially bothered one way or the other.
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