Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!linus!decvax!microsof!uw-beaver!tektronix!zehntel!ihnp4!ihldt!dbg From: dbg@ihldt.UUCP Newsgroups: net.audio Subject: re: KLH anyone?? Message-ID: <1762@ihldt.UUCP> Date: Wed, 6-Jul-83 18:32:07 EDT Article-I.D.: ihldt.1762 Posted: Wed Jul 6 18:32:07 1983 Date-Received: Fri, 8-Jul-83 17:22:17 EDT Lines: 34 Just to set the record straight, Henry Kloss did NOT found Acoustic Research, Inc. of Cambridge, Mass. He was recruited to work for AR by its founder (and the inventor of the acoustic suspension concept), Ed Villchur. Henry Kloss had some differences of opinion with Villchur and left the company to start KLH. Rumors held that Kloss had more differences of opinion with his KLH partners. He left KLH to form Advent, and to produce what I thought was an excellent and affordable loudspeaker. Kloss is currently in the projection TV business. The last I heard about Villchur he was working on audio devices for the hard of hearing. Incidently, a few licenses were sold for the acoustic suspension concept but not nearly as many as there were companies using the idea. The decision was made not to pursue violations and the patent became useless. The acoustic suspension notion brought about changes to drivers resulting in high compliance. Subsequent investigations by Novak showed that high compliance drivers were better in ported systems as well. A.N. Thiele later wrote THE definitive treatment on loudspeaker design for vented enclosures. Thiele's work can be summed up by a few equations based on Fs, Vas, and Qe. These equations lend themselves quite readily to vis programs for determining enclosure design for a given driver. I now use these programs as a starting point for all my designs (thanks to bas who wrote the initial versions). ihldt!dbg dbg Loudspeakers (now only a hobby and in need of a better workshop) p.s The above deals only with low frequency (piston action) reproduction. The rest of the spectrum and crossing over to it is another dozen stories. (by the way, Roy Allison also started as a mentee of Ed Villchur at AR)