First Midrange Horn
This page is kinda lengthy but it should be readable as the photos load.
Here I've placed some photos of old drawings made during my first attempt at adapting a Wharfedale Super 3 tweeter to use as a midrange horn driver. All parameters of the cone assembly had to be measured very carefully as a plaster phasing plug was to be designed to fit over the cone and very close to it. These photos are rather large but compressed in jpg format so the file size is still somewhat small. To see a larger view, click on any photo. They are readable in full size.
The intent of this page is to give the reader an appreciation of what went into my obsession with building a fully horn loaded system similar to the venerable Klipschorn. I just HAD to understand how that thing worked. I could have purchased midrange drivers but money wasn't as readily available back then as were the drivers; so I made do with what I had. When the system was complete, although never cosmetically finished, a friend drove 30 miles at night for an audition. He was silent as he listened to his favourite Beethoven, Piano Concerto No. 5. Having a piano at home himself, he mentioned that had he not known he was listening to speakers he'd have sworn it was a real piano. The highlight of the audition came with Beethoven's 5th symphony, second movement. The kettledrums were nothing less that awesome. Never before in my life had I experienced such a moment of elation. It was quite an emotional experience. A little over a year later, unbeknownst to me at the time, another such moment was bestowed upon me; Phoenix, Az., Jerry's Audio, May 8, 1975, when I had the prestigious honor of showing and discussing these papers with one Paul Wilbur Klipsch. The whole story is related here.
Anyway, here they are, with comments attached. Enjoy. :)