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kkantor

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About kkantor

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  1. Roy F. Allison: 1927–2016

    I am very sorry to hear this. Roy was a fine human being, and one of the pillars of loudspeaker theory and design. I will always remember him for his brilliance, kindness and support. -k
  2. Roy's listening 9 vs NHT 3.3 vs 10Pi

    Hi, all... I just found this. Many thanks, I am really touched! You all have ears I respect. (I mean, even before I read this....:-). There is one thing I wanted to say: While the 3.3 was obviously irrelevant to the design of the 9, it is highly likely that there never would have been a 3.3 had the 9 not preceded it. The AR9 was a very, very important speaker design; a breakthrough in many ways. -k
  3. Pictured are Alex deKoster, Ron Fone, Dan McGrath and your's truly. -k
  4. Bob Berkovitz

    I am sorry to report the passing of Bob Berkovitz: http://www.legacy.com/obituaries/bostonglobe/obituary.aspx?n=robert-a-berkovitz&pid=151281799 Bob ran AR's Research Department during its most productive years. He also designed and wrote many of the Company's technical marketing and educational tools. His contributions to AR and to audio research in general, are far deeper than many people realize. In addition, he has done important work in many areas of study related to hearing, language, perception and measurement. -k
  5. Advent Design Concept

    I'm with you on the commercial impact of Bose. Let's also give some props to Varese, Xenakis, Stockhausen, Pink Floyd, John Lennon, ELP, LSD and the general adoption of spatialization as a compositional element in the popular music of the 60's. A bit out of the public consciousness, Blumlein in the 30's, Snow, Moir, Olson in the 50's, (and many other researchers around the world), published extensively about stereo image quality using terms very similar to those found in the popular press today. -k
  6. Link to the 1956 Audio League Report

    Ah, the good old days of 8" tweeters, slightly-above-ground-plane measurements, reviewers that couldn't be bought, and speaker cables that you could twist around a #6 screw. Surely the Golden Age of high fidelity. Thanks for this link. Fun reading. -k
  7. the Kitchen is closed

    Sheesh, out of town for a few days, and the Kitchen is closed. Even though I had some complaints, and wasn't hesistant to pass them along, I would have ideally liked the Kitchen to transcend the few posters dedicated to ritually abusing it. Ah well, I understand Mark's and Gene's realistic position. It was fun while it lasted! -k
  8. I meant to reply to this sooner, but anyway... Great vignette! There are all kinds of potential snappy retorts, none of which would have come to mind in the actual situation. I think I remember that big freight elevator. There was a cabinet floor, a driver/crossover floor, a warehouse/inventory floor, an office floor? Am I even close, or mis-remembering? -k
  9. AR3a Directivity

    Indeed. Over the course of the original design effort, as well as subsequent design revisions, CD was removed from the list of goals for these tweeters. In fact, the D-S-T (ne: Tymphany, etc.) has tested many, many waveguide designs over the years. Sometimes these were done for well-know customers, sometimes these were done as R&D projects, sometimes these were tests of 3-rd party designs that were offered up for license. There is a huge body of work in this field. The names often mentioned here are but the tip of the iceberg. It's not the people don't know how to do CD horns, at least not in the real world. I remember lots of young engineers who worked for me at various places over the years, (AR included), who loved to spend their weekends making these. Defining a clear business proposition and sonic advantage is always the catch. Speaking of which, I gotta catch a plane soon... bye. -k -k
  10. AR3a Directivity

    1- The first "if" is a loop of circular reasoning. It sounds like you are trying to prove it doesn't work by saying it doesn't sell because it doesn't work. Does AR's popularity, (such as it was), prove that all of the company's technical assertions were correct? Of course not. 2- Power handling, cost, ease of manufacturing, all contribute to a tweeter's commercial viability. (eg- Defense against errant fingers is one the the >real< reasons that soft domes got popular. ) 3- The "Allison" approach is not without legacy. (eg- some ScanSpeak and Vifa models, etc.) 4- I have a casual opinion, (no more than that), that this approach to tweeters has a relationship to the use of diaphragm flexure to assist the hf directivity of woofers. -k
  11. AR3a Directivity

    Quick comment I've lost track of the key points of this thread. But, much research and field experience at AR, (consistent with tests I made and posted here recently in communication with Zilch), suggests that silicone grease is not a useful coolant in tweeters. It neither stays in the gap, nor does it conduct heat as well as ferrofluid. It does add some mechanical damping, until it migrates. -k http://picasaweb.google.com/kkantor/Ar#
  12. Pete, Here is a link to some 12" data that was very easy to find: http://admin.officedesktop.kkantor.operaun.../12woofevodata/ Password is: ar12data I think the summary spreadsheets in the root directory are the most comprehensible. I'll add the data on the other drivers as it turns up. -k
  13. I laughed out loud at the "captain of industry" image! Yup, that's us audio guys. More like the Captain on Gilligan's Island. All the fun is in trying to be rescued... -k
  14. If you shut down: - All your existing investors lose everything. And are not happy. Some might even sue you for breach of fiduciary duty for not accepting the money to allow a going concern, just so you can keep control. - The vendors who have worked with you, probably extended terms, are screwed. - The employees who joined your new venture, worked long hours at less than market salary, sometimes for free, have no job. - You are now on a downward career spiral, since you have pissed off all the constituencies you need to start your next biz, so the terms will be tougher, less slack will be cut, etc. If you stay open, but lose control: - Everyone but yourself is definitely happy. You are >probably< happy, at least because your name and ideas can reach the market. - Investors are particularly happy, since the company succeeded, they got a larger share than planned. Your ability to finance your next effort goes up exponentially. If you stay open, but don't lose control: You are Bera Soma, Dead Villian, Frandy Peed or one of the other two or three true business savants in all of audio history. -k http://www.audioheritage.org/images/jbl/co...d130-magnet.jpg (For the record: I do >NOT< recommend the way Jim Lansing eventually is allegedly to have attempted to fund his struggling biz.)
  15. Interesting. Do you know who put up the seed money for the founding of Snell? Was it a "friends and family" effort? Indeed, as we have talked about, the undercapitalization of small- to mid-size US manufacturing is a very serious and very long-term problem. It is hard to see that changing without some serious policy help. -k
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