Klipsch Heresy IV Floorstanding Speakers

Heresy IV

A Klipsch Heritage Classic, proudly designed and made in the USA.

Heresy offers unparalleled sonic qualities from a (relatively) small floor standing speaker. Whether it's for your vinyl collection, home theatre, or streaming — the Heresy IV will knock your socks off and bring the live music experience to your living room. 

They said he couldn't. He did anyway.

When Paul W. Klipsch was developing a smaller speaker for use between two Klipschorns, an acquaintance declared that he couldn't possibly introduce it to the public because it was in direct violation of the corner horn principles, and amounted to acoustic heresy. 

"The hell I can't," Mr. Klipsch said. "And that's exactly what I'm going to call it!" 

A year later, the Klipsch Heresy loudspeaker was introduced. Ironically, it even became a bestseller in the church sound reinforcement market.

A little Heresy is good for the soul.

Because of its size, the Heresy offers the greatest degree of placement flexibility in the Heritage series. First introduced in 1957, this three-way horn-loaded loudspeaker is still able to deliver the awe-inspiring Klipsch sound that our fans around the world know and love.

Designed and made in the USA.

The Klipsch Heresy IV speaker is a testament to the quality that Klipsch demands from each and every one of its audio products. Remember great sound? We do, too. The Klipsch Heresy enclosure is made in the USA, by proud craftsmen in Hope, Arkansas — just like Paul W. Klipsch (PWK) intended.

Drivers.

The 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.

Network.

The Heresy IV has been completely re-voiced from its 2006 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 larger Klipschorn, La Scala and Cornwall speakers.

Rear Tractrix ports.

For the first time in its long legacy, the Heresy now 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.

The Heresy’s premium, aluminum input panel accommodates large, high-quality speaker cables. Strong, versatile and quality 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. Flexible placement.

Nothing in the industry sounds as big or is as efficient as the Heresy, given its relatively compact floorstanding size. This model offers the greatest degree of placement flexibility of the Heritage series. The bonus slant riser base — now in a black finish for a floating appearance — 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.

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. 

Heresy IV is available in a high-quality Satin Black Ash, Natural Cherry, Distressed Oak, or American Walnut wood veneer finish. A set of magnetic grilles are included, in a classic salt and pepper weave for black ash, cherry, and walnut speakers. The new distressed oak finish features a lambswool grille cloth.

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, AR to the engineers in Indianapolis, IN, 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.

Specifications:

Frequency Response

48-20k +/-4dB

Sensitivity (average listening room)

99dB @ 2.83V / 1m

Power Handling (cont/peak)

100W/400W

Maximum SPL

116dB Continuous

Nominal Impedance

8 ohms Compatible

Crossover Frequency

HF: 4500Hz MF: 850Hz

High Freqency Driver

K-107-TI 1” (2.54cm) Titanium diaphragm compression driver

Midrange Driver

K-702 1.75” (4.45cm) polyimide diaphragm compression driver

Low Frequency Driver

K-28-E 12” (30.48cm) Fiber-composite cone woofer

Enclosure Material

MDF

Inputs

Dual binding posts / bi-wire / bi-amp

Height

24.81” (63.01cm)

Width

15.5” (39.37cm)

Depth

13.25” (33.66cm)

Weight (each)

45lbs (20.41kg)