Heresy Changes in detail:
. HERITAGE PRODUCTION NOTES & TIME LINES:
1. HERESY:
1957: The Heresy is introduced as a center channel for the Klipschorn. It is the first Klipsch speaker that does not require corner placement. This model utilized the K-1000 midrange horn. These are rare, and one example in the Museum in Hope is the rarest of all the Klipsch Heritage speakers.
1957 - 1959: Both 8" and 12" woofer versions were produced during this period.
1967 - The H-700 is introduced in the now familiar format using a 12" K-22 woofer (There were several variants used E, EF, K) K-700 horn; K-55-V mid-range and the K-77 (T-35 type Alnico magnet) tweeter.
From this date through the end of the model run in 1985, various networks were used: Type C, Type E and Type E-2. All were variations on the same design.
1972-1973: The Heresy's name is changed from H-700 to Heresy.
1983-1984: The K-24 woofer is substituted for the K-22, and during the last production of the Heresy-I, the midrange K-53/701 is substituted for the K-55/700.
1985: The Heresy II is introduced using a mid-range and tweeter driver set that, for the first time since the introduction of the H-700 differed from that of the Klipschorn. Component designations were: Woofer K-24-K, Midrange K-701 horn and K-52 driver (the mid range assembly was also stamped K-53 on the driver). The tweeter is K-75-K horn and K-76 driver. This was the first Heresy model to discontinue the use the traditional alpha numeric network designations (Type E-2). All of the drivers in the Heresy II were front mounted to reduce the diffraction effects caused by rear mounting and firing through the motor board.
May 2001: Finish, grill and riser variant options are reduced from nearly 100 to 10.
Sept 29, 2005: The Heresy III is introduced featuring increased sensitivity (3dB), Titanium mid-range and tweeter diaphragms, Tractrix tweeter horn and bi-wire inputs. Component designations are: Woofer K-28-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). Finish, grille and riser variations are further reduced from 10 to 3.
May 2006: The Heresy III midrange compression driver is sourced to a new supplier and the network is revised to compensate for the change.
2008+: There have been a number of improvements produced, and Klipsch has transitioned the crossovers to a more modern design. For information on the recent changes, please go to the website (Klipsch.com) for product information.