But I think the delta PRO 15 is a solid candidate for this box. Unless they changed drastically in the last year Kappas don't like big boxes. Delta Pro works with this box, Has depth similar to Delta 15-A(tuned to 33 is my favorite), and is easy to drive. Bass may not be real important to you, but most hot 15's can't do lower than 50. Delta Pro has same output as the 15-a at 30Hz a bit less bass aroud 100 and sounds a bit more muscular overall. The smoother response above 800 sound right up your alley too. Compare the frequeny response plots and boxplots for a general clue. It sounds about what you would expect from the modelling and response data. I think Bill Epstein also has these so you might ping him on this if you are interrested. Thomas