moray james Posted May 11, 2011 Share Posted May 11, 2011 KlipschCorner.com A Klipsch, Aragon, and audio heritage fan site [Home][special Features][Articles][system Profiles][Reviews][Classifieds][FAQs][Tools][My Account][Contact] History of the Klipsch Cornwall, Cornwall II, Cornwall III This is a timeline for the evolution of the Klipsch Cornwall speaker from inception in 1959 to the current date. Date Event Media October 1959 The Cornwall is introduced as the world's second commercially produced center speaker. A speaker with higher output capability than the Heresy was needed when used in three speaker arrays between Klipschorns®. Component designations: Woofer EV 15WK, Midrange K-1000 Horn and University SAHF Driver, Tweeter K-77 Late 1959 Transition to the K-33-J Woofer (Jensen) 1959-1961 Sporadic transition to the K-55-V mid-range driver (Atlas). January 1963 The K-1000 diffraction type midrange horn was replaced with the exponential K-600 horn with a lower (600 Hz) cutoff September 1967 Transition to the K-33-M. The records are not clear as to the origin of this driver but it is believed to be an Eminence driver with an Alnico magnet. January 1968 Transition to The K-33-P Woofer (CTS Paducah KY) 1974 The horizontal version of the Cornwall is discontinued. K-56 mid-range driver (Electrovoice 1828) is used for a short period as a temporary replacement as the supply of K-55-V drivers was interrupted. 1975 Transition to The K-33-B Woofer (CTS Brownsville TX) 1975-1879 K-33-E (Eminence) and the K-33-B were used interchangeably. The records are not specific about the actual start date for the K-33-E but it is believed to be in the early to mid 1970's 1979 The Eminence K-33-E woofer is used exclusively June 5th, 1981 The updated B2 network, with steeper crossover slopes is phased in with no changes to the K-33-E, K-55-V and K-77-M driver compliment. October 19th, 1981 - March 1983 The transition between four different iterations of the midrange driver from revolving sources occurs during this period. The original K-55-V was changed to a K-51-V (10/19/81) This marked the first time in the Cornwall's history that it used a driver set that differed from that of the Klipschorn®. The K-51-Vwas then changed to the to the K-55-G (essentially a ceramic magnet version of the Atlas Alnico K-55-V). The K-55-G was then changed to the Hepner built K-52-H and finally the Klipsch built K-52-K. March 14th, 1983 The B-3 network and the K-52 midrange driver starts to be used in this model.Component designations were: Woofer Eminence K-33-E, Midrange K-57-K (K-600 Aluminum horn and K-52-K driver with snout), Tweeter K-77-M and B-3 network. January 1986 The Cornwall II is introduced featuring front mounted drivers to reduce baffle induced diffraction effects. Component designations were: Woofer Eminence K- 34-E (K-33-E with a dressy pad ring), Midrange K-57-K (K-601 plastic horn and K-52-K driver), Tweeter K-79-K (K-75-K horn and K-79 driver) and CW II network. 1990 The Cornwall II is discontinued. March 2006 The Cornwall III is introduced marking the end of the Cornwall's 15 year absence from the market. This version utilizes the Klipschorn® woofer, the horn and driver set from the Heresy III (featuring Titanium diaphragms and a ® tweeter horn) and bi-wire inputs. Component designations are: TractrixWoofer K-33-E, Midrange K-53-Ti (K-701 horn and K-53-Ti driver), Tweeter K-107-Ti (K-79-T horn and K-100-Ti driver). Information originally provided by Jim Hunter and Mark Kauffman of Klipsch Audio Technologies, LLC Quote Link to comment Share on other sites More sharing options...
Groomlakearea51 Posted May 11, 2011 Share Posted May 11, 2011 In context, this is the thread that I wrote that wraps it all together (approved by Jim, etc. al.) http://forums.klipsch.com/forums/t/103886.aspx Quote Link to comment Share on other sites More sharing options...
moray james Posted May 11, 2011 Author Share Posted May 11, 2011 Thank you: am I reading correctly the the horn lens on a K-79-K tweeter from a say a Chorus ll is a tractrix profile like the tweeter now used inthe Heresy lll? Best regards Moray James. Quote Link to comment Share on other sites More sharing options...
BEC Posted May 11, 2011 Share Posted May 11, 2011 I gotta see that "Tractrix Woofer" mentioned in the March 2006 comment. Quote Link to comment Share on other sites More sharing options...
moray james Posted May 13, 2011 Author Share Posted May 13, 2011 I compared a K-75-K tweeter lens to a K-79-K lens and to my tired eyes they look identical in size and profile. I would imagine that since the Tractric profile opens up faster than an exponential profile that a Tractrix horn would be a little shorter in length. Does anybody here have a new Heresy lll (which uses the tractrix tweeter) as well as a K-79-K tweeter horn and could you post side by side photos so we can see the difference between the two? Is there anybody in Calgary with the Tractrix tweeter in either a Heresy lll or a Cornwall lll as I would like to have a look and especially a listen to them to see if there is much of a difference. I could bring over a set of K-79-K with Titanium diaphragms installed for a direct comparrison. Send me a PM if you are interested. Quote Link to comment Share on other sites More sharing options...
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