Endless Fun: Klipsch Heresy IV Floor-Standing Loudspeakers Feature 12-Inch Woofer, Horn-Loaded Midrange, and Extraordinary Freedom of Placement

With the Klipsch Heresy IV floor-standing loudspeakers, you're investing in the loudspeaker equivalent of a classic muscle car that causes everyone to look twice as you cruise around town, press down on the gas, and throw your head back. True to its rebellious name, Heresy IV is all about fun – and thrilling sound. Designed and made in the U.S.A., and ideal for tube amplifiers, the high-efficiency Heresy IV claims a continuous-production heritage that stretches all the way back to its original 1957 model – a longevity that attests to its high-end sound, versatility, craftsmanship, value, and looks. Those timeless aesthetics stem from book-matched veneers and grain-matched handcrafted cabinets that create an identically paired set of speakers.

Enhanced with a 1.75-inch K-702 midrange compression driver mated to a K-704 Tractrix horn, Tractrix ports, and a premium high-fidelity network drawing from the classic three-way steep-slope design of Klipsch's Klipschorn and La Scala models, Heresy IV plays much, much bigger than its compact 24.81 x 15.5 x 13.25-inch (HWD) size suggests. You'll be hard-pressed to find a speaker that delivers the combination of massive sonics and high sensitivity anywhere near its cost or user-friendly dimensions. Named after what an acquaintance told company founder Paul Klipsch when the latter declared his intent on creating a compact speaker to serve as a third channel between two Klipschorns, Heresy IV reinforces the notion that the seemingly impossible can be achieved with innovative acoustic engineering. Indeed, its smooth, clean, crisp, and authoritative performance stands out as much as its distinctive appearance.

Also inside, a one-inch K-107-TI titanium diaphragm tweeter with wide-dispersion phase plug delivers smooth, accurate playback that helps turn recordings into living, breathing works of art capable of sending shivers down spines and goosebumps across arms. But Heresy IV's not-so-well-kept secret pertains to its direct-radiating K-28-E 12-inch fiber-composite cone woofer. If you've been thinking taut, punchy, feel-the-instruments-in-my-room bass response is only possible from enormous floorstanders, Heresy IV will change your mind. Walk into a room and Heresy IV becomes the topic of conversation – even if the speakers are just sitting there, chomping at the bit to play.

And it couldn't be easier to set up Heresy IV in your room. Position them a foot or so away from your walls, hook them up to an amplifier (again, tubes sing with Heresy IV), play a record, and sit back in awe. The choice of three cabinet veneers, the inclusion of a removable slant riser base, Klipsch's 10-year warranty, and our Satisfaction Guarantee make any decision to pass on auditioning this thrilling speaker in your own home utter heresy.

"Simple to accommodate, and impressively easy to drive, this three-way will bolt on to any amp and make you sit up and listen. It brings music to life in a style that many rivals don't, and while it looks ol' fashioned, it sounds thoroughly modern...and totally Klipsch."
—Mark Craven, Hi-Fi News, Highly Commended review

"The Klipsch Heresy IV has a lineage that can be proved by DNA testing, a look that's barely changed over half a century, and unlike many famous [brands] that are trading on their former glories, the Heresy IV is still manufactured in the good ol' USA, in Hope, Arkansas. The only thing that has really changed is the sound ... and that change has been for the better."
—What Hi-Fi?

All-New Midrange Driver and Tweeter

Heresy IV incorporates an all new K-702 midrange compression driver, featuring a polyimide diaphragm for exceptional detail and dynamics. The K-702 midrange is mated to the K-704 Tractrix horn, providing you with a wide coverage pattern and smooth response throughout the listening area. The K-107-TI titanium diaphragm high-frequency driver features an all new wide dispersion phase plug, providing exceptionally even high frequency dispersion throughout the listening area, making for a wider, more accurate sweet spot.

Advanced Network Drawn from Klipschorns

The Heresy IV has been completely re-voiced from its predecessor, utilizing premium componentry in an all new high-fidelity network – minimizing electrical degradation throughout the circuitry – for truer-to-life sound with best-in-class efficiency and power handling. The new network draws from the classic three-way steep slope design of the legendary Klipschorn, La Scala, and Cornwall speakers.

Tractrix Ports

For the first time in its long legacy, Heresy features a rear port – improving low-frequency extension by almost 10Hz for room-filling bass. Utilizing Tractrix geometry, the all-new Heresy IV ports allow for the most efficient, fastest air transfer in their class, which reduces port noise for punchier low frequencies. Klipsch Tractrix ports have custom-designed inner flares that help reduce air turbulence entering the port. Less turbulent air helps reduce port noise for cleaner, more powerful bass.

Bi-Amp Input Panel and Binding Posts

Heresy's premium, aluminum input panel accommodates large, high-quality speaker cables. Strong, versatile, premium binding posts provide the capability for bi-wiring or bi-amping. The quality continues with AudioQuest Type 4 with Star-Quad Geometry internal wiring featuring carbon-loaded insulation, nitrogen-injected PE, and solid long-grain copper conductors ensuring the purest signal transfer from input cup to crossover network to drivers.

High Efficiency

Nothing in the industry sounds as big or is as efficient as Heresy, given its relatively compact size. This model offers the greatest degree of placement flexibility of the Heritage Series. The bonus slant riser base can be removed for cabinet installations.

Matched Pairs

Every pair of Heritage series loudspeakers is grain-matched, using wood veneer panels that come from the same timber. Each cabinet is carefully matched so that each speaker in the pair is practically indistinguishable from the other. The speakers move seamlessly together through the factory, and each finished product is inspected and labeled with sequential serial numbers, ensuring that your Heritage Series speakers leave the factory as a meticulously crafted set.

Book-Matched Wood Veneer

Klipsch only uses book-matched wood veneers for the Heritage Series. The veneer leaves are kept in order as they are delicately sliced from the timber and precisely arranged to provide a mirror image at the splice joint – like turning the pages of a book. This gives each speaker an aesthetically appealing and consistent appearance that is treasured more than any other cut of wood veneer.

Built to Last

While each and every component of the Heresy IV is built to last. Klipsch has always recognized the unique and critical role of a loudspeaker's cabinet in the sound reproduction process. From the craftsmen in Hope, Arkansas, to the engineers in Indianapolis, Indiana, Klipsch has always put an extraordinary emphasis on cabinet design. The Heresy enclosure is assembled using only the highest-grade adhesives and fasteners. The riser base can be removed for cabinet installation or placement on optional stands.