freddyi Posted March 19, 2007 Share Posted March 19, 2007 also - are there engineering notes missing from this forrum? a couple of cool letters PWK - caps, CD http://img412.imageshack.us/img412/3977/pkafl7.jpg PWK (maybe pulling my leg) T-S http://img63.imageshack.us/img63/5995/ptslz6.jpg Quote Link to comment Share on other sites More sharing options...
boom3 Posted March 20, 2007 Share Posted March 20, 2007 Thanks for posting those. I had, and may still have, a letter or two from Paul on the beautiful stationary featuring copper bands embossed in the top. About the T-S letter, this was written, I am pretty certain, just before Don Keele introduced T-S to Paul and two years before Keele's 1977 AES paper, "Low Frequency Horn Design Using Theiele-Small Parameters" Quote Link to comment Share on other sites More sharing options...
D-MAN Posted March 20, 2007 Share Posted March 20, 2007 Looks like 1985... (!) However, PWK is absolutely correct in his response, the T/S params of the K33(x) put it way out there into unpredicable territory when under compression such as in a Khorn. DM Quote Link to comment Share on other sites More sharing options...
boom3 Posted March 21, 2007 Share Posted March 21, 2007 Oops, yeah, it WAS '85...so much for that...maybe Paul never accepted Don's paper...oh well Quote Link to comment Share on other sites More sharing options...
mark1101 Posted March 21, 2007 Share Posted March 21, 2007 Interesting how PWK alludes that building a bass horn larger than the Khorn's for home use would only benefit power handling capability and deafening rock and roll headbangers. He made it sound like he wasn't interested in doing it. I guess he changed his mind on that one later on. Quote Link to comment Share on other sites More sharing options...
freddyi Posted March 21, 2007 Author Share Posted March 21, 2007 re: PWK's remarks on TS - couldn't figure out if he was joking or implying an incompleteness of that conversion vs real worldspeakers. Although PWK had some years accumulated by 1985 his work and wit always seemed very sharp. Is K33E now out of bounds for commonly available simulators such as Hornresp, MJK's worksheets and AJ-horn? Where do modern similators and TS begin to fall apart vs reality? What might be improved in future modeling? FWIW here's a sim of one K33E spec (fs 34.46, qes=0.41) vs 2035H and 2220H with a midbass about like Edgar's old system 100 http://img133.imageshack.us/img133/281/midbassdof3.jpg Quote Link to comment Share on other sites More sharing options...
D-MAN Posted March 21, 2007 Share Posted March 21, 2007 I think PWK was right, the measured K33(x) T/S parameters put it outside of the accepted workable horn formulas, so I would agree that it cannot be accurately modelled by most horn programs that I know of. It remains a matter for empirical testing. The Keele formulas, for instance, would predict the optimum efficiency of the K33E at a throat size (St) of 115 sq. in. and a Vb of rather large volume at 9343 cu.in. Not practical, in other words. This all changes when under pressure as in the Khorn and equivalents. I think that he's used to dealing with John Q. Public on the whole, so what he says may be watered-down quite a bit (for public consumption, as it were), but the gist of what he said is entirely correct IMO. DM Quote Link to comment Share on other sites More sharing options...
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