The Klipsch Heresy IV at a glance
The Klipsch Heresy IV is the most compact member of the hand built Heritage line, and it carries the same design philosophy Paul W. Klipsch set out in 1946. It is a three way, horn loaded floorstander that stands on a slight riser to angle the sound toward the listening seat. Despite its modest footprint of 24.8 by 15.5 by 13.25 inches and a weight of about 45.3 pounds each, it delivers the immediacy and lifelike dynamics that horns are known for.
At its heart is Klipsch's dedication to horn loading. The Heresy IV pairs a 1 inch titanium diaphragm compression tweeter and a 1.75 inch titanium diaphragm compression midrange, each loaded on a Tractrix horn, with a 12 inch fiber composite cone woofer. Crossover points sit at 850Hz and 4500Hz, and the enclosure is a plywood cabinet finished in real wood veneer Heritage finishes with a rear firing Tractrix port for bass reflex loading.
What the technology does for the sound
Tractrix horn loading
Horn loading is the signature of the Heritage line. By coupling the compression drivers to Tractrix horns, the Heresy IV controls dispersion and presents vocals and instruments with a directness and clarity that make live recordings feel present in the room. The titanium diaphragms keep the treble and midrange crisp and detailed without harshness.
High sensitivity, low power friendly
The Heresy IV is rated at 99 dB sensitivity at 2.83V at one meter with a nominal 8 ohm impedance. That efficiency is one of the most important things to understand about this speaker. It plays loud and lively on very little power, which means it partners beautifully with low wattage tube amplifiers as well as capable solid state amps. You do not need a large amplifier to bring this speaker to life, and that opens the door to a wide range of thoughtfully chosen electronics.
Bass reflex in a compact cabinet
The 12 inch woofer works with a rear firing Tractrix port to reach down to 48Hz within plus or minus 3dB. This is a room friendly bass character rather than a subterranean one, which suits smaller and medium rooms and lets the Heresy IV live close to a wall while still breathing.
Where the Heresy IV sits in the Heritage range
The Heresy IV is the entry point into the hand built Heritage family, and it is the one that fits comfortably where a larger horn simply will not go. If you have the room and want more scale and low end reach, the Klipsch Forte IV steps up with a larger cabinet and a rear firing passive radiator, while the Klipsch Cornwall IV brings an even bigger enclosure and greater output.
Further up the line you reach the fully horn loaded designs. The Klipsch La Scala AL6 and the corner loaded Klipschorn AK7 are large scale statement systems, and the Klipsch Jubilee is a horn system with an active DSP crossover and bi-amplification. Each of these asks for progressively more space. For a horn character in a more conventional tower shape, the Klipsch RF-7 III offers another path. The Heresy IV earns its place as the compact Heritage choice that keeps the horn tradition without dominating a room.
The ideal system and use case
The Heresy IV is a passive loudspeaker, so it needs amplification and a source to build a complete system. Its high sensitivity gives you real freedom in how you assemble that system. It shines in small to medium rooms, in dedicated listening spaces, and in living rooms where a tidy footprint matters. It is equally at home with vinyl, digital streaming, and everything in between.
Amplification thoughts
Because the Heresy IV is so efficient, you can lean into the character you prefer rather than chasing wattage. The LEAK Stereo 230 Integrated Amplifier is a lovely match if you want a warm, musical presentation with plenty of headroom to spare. The Audiolab 7000A Integrated Amplifier offers a clean, versatile solid state foundation with built in connectivity, and the TEAC AX-505 Stereo Integrated Amplifier brings a refined, precise character in a compact chassis. If you would like network streaming and a receiver in one box, the Yamaha R-N1000A Network Receiver is a tidy, feature rich single unit solution.
Source and separates
For vinyl, the TEAC TN-5BB Manual Belt-Drive Turntable makes a natural analog partner. For streaming, the EverSolo T10 Streaming Transport feeds a high quality digital signal to your chosen DAC or amplifier. If you prefer to build with separates, the Audiolab 9000Q Preamplifier and the TEAC UD-507 USB DAC, Headphone Amplifier and Preamp both give you flexible front end options to match the Heresy IV's transparency.
How it compares within the category
The Heresy IV is defined by its horn loaded, high sensitivity design goal, which prioritizes dynamic immediacy and living presence. If your taste runs toward a more traditional acoustic suspension voice, the KLH Model Five and the larger KLH Model Seven offer that classic sealed box character. For a refined, box quiet British monitor voicing, the Spendor A4.2 and the more compact Spendor A2.2 present music with a smooth, even balance. These are different roads to musical enjoyment rather than a matter of one being ahead of another. The Heresy IV is the choice when horn dynamics and low power flexibility are what you are after.
Frequently Asked Questions
What is the Klipsch Heresy IV in brief?
The Klipsch Heresy IV is the most compact member of the hand built Heritage line, and it carries the same design philosophy Paul W. Klipsch set out in 1946. It is a three way, horn loaded floorstander that stands on a slight riser to angle the sound toward the listening seat. Despite its modest footprint of 24.8 by 15.5 by 13.25 inches and a weight of about 45.3 pounds each, it delivers the immediacy and lifelike dynamics that horns are known for.
Who is the Klipsch Heresy IV best suited to?
The Heresy IV is a passive loudspeaker, so it needs amplification and a source to build a complete system. Its high sensitivity gives you real freedom in how you assemble that system. It shines in small to medium rooms, in dedicated listening spaces, and in living rooms where a tidy footprint matters. It is equally at home with vinyl, digital streaming, and everything in between.
What should I pair with the Klipsch Heresy IV?
Because the Heresy IV is so efficient, you can lean into the character you prefer rather than chasing wattage. The LEAK Stereo 230 Integrated Amplifier is a lovely match if you want a warm, musical presentation with plenty of headroom to spare.
How does the Klipsch Heresy IV compare to the alternatives?
The Heresy IV is defined by its horn loaded, high sensitivity design goal, which prioritizes dynamic immediacy and living presence. If your taste runs toward a more traditional acoustic suspension voice, the KLH Model Five and the larger KLH Model Seven offer that classic sealed box character. For a refined, box quiet British monitor voicing, the Spendor A4.2 and the more compact Spendor A2.2 present music with a smooth, even balance.
Arrange a listen
AEA is an authorized Klipsch dealer with a showroom in Timonium, Maryland. Demo units rotate and not every model is always set up, so we invite you to contact AEA to arrange a listen and hear the Heresy IV with electronics matched to its wonderful sensitivity.