Thanks Brian.. After some deep web searches I found the following in the "what's best" forum but still cant find any physical reference to this speaker. I wouldnt know where to start.. could you suggest a value? Obviously they would need to be picked up or shipped, which would likely be no small task as these are LARGE speakers From a 2014 post speaking about Fulton
https://www.whatsbestforum.com/threads/audiophile-fundamentalism.15356/page-3 ""Of his full-range speakers, I liked the one he made just before he died suddenly the best. This one used the 'Oval Window' concept, which could play an octave below the cutoff of the woofer drivers, allowing him to use an array of smaller (faster) woofers. I have a recording, Canto General, which I had made in the 1980s; that last speaker played exceptional bass relative to the prior speakers, rendering the bass drum in the recording with great ease. It was also easier to drive. The Oval Window was apparently a modified Helmholtz resonator""