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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)