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RE: Apologies for the long post, answers and some speculation on the ribbons

Posted by josh358 on September 11, 2010 at 19:13:34:
Thanks, that was an unusually informative food fight. Among other things, I had no idea that ribbon corrugations helped to reduce torsional motion, although in retrospect it's obvious.

The sonic differences between the true and Kapton-backed ribbons don't surprise me, they seem very much in line with the generic differences between the technologies.

Still no idea how and to what degree Graz has solved the torsion problem, but my interest was essentially academic, anyway. Though I gather he could run off a true ribbon midrange if you were wanted one. While reading more about the RD-75, I came across an interesting project by someone who put an Acoustat 1.1 on either side of the RD-75 and a line of leaf tweeters. He crossed the RD-75 over at about 650 Hz, which kind of makes me wonder whether his setup doesn't suffer from lobing. Still, he said it's the equal of $75,000 speakers, and I believe him.

I'm not sure what to think about the RD-75 -- I'm tempted by that 150 Hz crossover, which would allow me to run it through the midrange and much of the treble. OTOH, I've come across criticism of its performance below 500 Hz, and it does beam. I understand that Wilson put three traces on it, presumably so that the highest frequencies can be limited to the center trace for better dispersion. I'm wishing that BG made their drivers that way, particularly the Neos 8 and 10 (assuming, of course, that you could get your hands on the Neo 10). In an array, the impedance variations of the various trace lengths wouldn't present a problem (I'm still wondering how Magnepan handles the lower impedance of the supertweeter trace in the 1.7 -- thinner foil?).