John Warren Posted August 24, 2003 Share Posted August 24, 2003 ---------------- On 8/22/2003 9:33:03 PM efzauner wrote: Also why the Klipsh reference have very rigid ceramic cones and can work well till almost 2KHz ---------------- Actually, the Klipsch cones are anodized aluminum. To ascertain that it does anything in regards to *stiffening* the cone would require that Klipsch release a detailed engineering evaluation proving the concepts out (don't hold your breath). Anodized layers are *typically* in the range of .001-.003 inches in thickness and are composed predominately of aluminum oxide. The *principle* reason for doing anodizing is to protect the surface from corrosion AND to improve its abrasion resistance (aluminum oxide is hard stuff). Klipsch claims that it improves the sound. That means that it is doing somethig to the cone to make it vibrate closer to some *ideal*. Does it offer enhanced resistance to *jelly-fishing* (the phenom that you where referring too)? If so that means that it is of sufficient thickness to increase the specific modulus of the cone (elastic modulus/density). In this case it is a layered material so we have to think about "composite specific modulus". The relationships for these systems are well established and a little effort with a calculator, a materials reference manual and a few basis assumptions about thickness could easily dispell any claim that it contibutes the a mechanical advantage relative to the minimizing cone break. Anodizing bare aluminum DOES make sense. Polish a bare sheet of aluminum let it sit around for a couple of weeks and guess what, it looks like crap. The naturally occuring aluminum oxide prefers to nuclete along grain boundaries and sometimes it just pits. It's not uniform when it forms naturally. Anodizing does makes the surface very uniform looking (cosmetic) and reduces the tendendy to pit (structural). These are good things but not glamorous. The job of Marketing is to make stuff up and this is what they do. Quote Link to comment Share on other sites More sharing options...
DrWho Posted August 30, 2003 Share Posted August 30, 2003 might i ask where u get all the equations and math from? it all seems so specific to speaker design, but i can't find a school in the world that teaches classes like that. (I haven't found any books either, but I haven't looked too hard) Quote Link to comment Share on other sites More sharing options...
John Warren Posted August 30, 2003 Share Posted August 30, 2003 ---------------- On 8/30/2003 8:17:00 PM DrWho wrote: might i ask where u get all the equations and math from? ---------------- The equations come from Richard Smalls papers published in the Journal of the Audio Engineering Society (AES) from 1969-1972. I have a stack of them by my pc. Quote Link to comment Share on other sites More sharing options...
ZAKO Posted August 30, 2003 Share Posted August 30, 2003 John thats cheating...You have the AES papers at your desk. I have to run 150 miles to St Louis Washington University Library. And thats how I got that heat rash that looks like your charts. Quote Link to comment Share on other sites More sharing options...
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