Klipschorn AK7 Heritage Loudspeaker (Each) at Vinyl Sound Toronto Canada

The Klipschorn AK7 is a three-way fully horn-loaded floorstanding loudspeaker from Klipsch (Hope, Arkansas, USA), available at Vinyl Sound in Toronto, Canada. The longest continuously produced loudspeaker in audio history, first launched in 1946 and now in its seventh major iteration, the Klipschorn AK7 is the flagship of the Klipsch Heritage Series below the Jubilee. The AK7 features the new K-1133-HP 3-inch phenolic diaphragm compression driver on the patented K-406M Tractrix midrange horn with Mumps technology, the K-771 tweeter with extended phase plug on the K-792 horn, and the K-33-E 15-inch fiber-composite woofer in a patented folded horn enclosed cabinet. With 103 dB sensitivity and a 34Hz to 19kHz frequency response, the AK7 is engineered for high-efficiency listening with low-power amplifiers and is fully compatible with the optional Klipsch Heritage Active Crossover tuned by master acoustician Roy Delgado. Handcrafted to order in Hope, Arkansas and backed by a 10-year warranty, the Klipschorn AK7 is sold individually in American Walnut, American Auburn, and Black Ash finishes.

K-406M Tractrix Midrange Horn with Mumps Technology

The most significant acoustic advancement in the AK7 over the outgoing AK6 is the introduction of the K-406M Tractrix midrange horn paired with the new K-1133-HP 3-inch compression driver. The Tractrix horn geometry is a mathematically derived profile that minimizes internal reflections and controls the rate at which the sound wave expands from the driver's throat, producing a smoother frequency response and lower distortion compared to exponential or conical horn profiles. The AK7's K-406M features a 2-inch throat diameter, shorter than previous Klipschorn midrange horns, which increases directional precision and tonal presence in the vocal midrange region. Mumps technology adds small asymmetric contours to the horn's outer geometry, correcting the diffraction anomalies that occur at a horn's edges and extending consistent frequency response coverage to wider listening angles. The K-1133-HP compression driver increases the diaphragm area by a full inch over the AK6's midrange driver, raising sound pressure at the horn throat for greater dynamic authority and headroom through the critical 400Hz to 6kHz midrange passband that carries the majority of vocal intelligibility and instrument body.

K-771 Tweeter with Extended Phase Plug and Patented Folded Bass Horn

High frequencies in the Klipschorn AK7 are handled by the K-771 compression driver, paired with a new patented extended phase plug that addresses one of the fundamental limitations of compression driver design. In a conventional compression driver, the transition from the circular diaphragm to the narrow driver throat creates path-length differences across the diaphragm surface that cause phase cancellations at high frequencies, softening the top octave response and narrowing the dispersion pattern. The extended phase plug equalizes the acoustic path length from all points on the diaphragm to the throat exit simultaneously, reducing these phase cancellations and producing cleaner, more natural high-frequency reproduction with a broader horizontal sweet spot. For the low-frequency section, the Klipschorn's patented folded horn enclosure uses the K-33-E 15-inch fiber-composite woofer to produce bass extension to 34Hz. The fully enclosed folded horn geometry compresses a long acoustic path into the speaker's cabinet volume by folding it back on itself multiple times, achieving the efficiency and bass extension of a horn many times the cabinet's physical size.

Optional Heritage Active Crossover Compatibility

The Klipschorn AK7 was engineered from the ground up to accommodate the optional Klipsch Heritage Active Crossover, a trickle-down technology derived directly from the active DSP crossover developed for the Klipsch Jubilee. The Heritage Active Crossover, tuned specifically for the AK7 and AL6 Klipschorn by Klipsch principal acoustician Roy Delgado, replaces the internal passive crossover with a line-level DSP unit that applies phase alignment, time delay correction, frequency-specific EQ, and gain adjustments to each of the three driver channels independently before amplification. This enables tri-amplification of the AK7 and produces a measurably flatter, more phase-coherent frequency response than the internal passive crossover can achieve. To support this upgrade path, the AK7's redesigned rear I/O panel includes both passive and active inputs alongside a passive output, making the transition between passive and active operation straightforward without any cabinet modification. The panel has also been relocated to the speaker's rear face for a cleaner visual presentation from the front and sides.

Key Features

• K-1133-HP 3" Midrange Compression Driver: A cinema-grade phenolic diaphragm compression driver with one inch of additional diaphragm area over the AK6 model, increasing sound pressure at the K-406M Tractrix horn throat for greater midrange dynamic headroom and authority.
• K-406M Patented Tractrix Midrange Horn with Mumps: A mathematically optimized Tractrix horn profile with a 2-inch throat and Mumps contour technology delivers smoother midrange frequency response, improved dispersion, and greater tonal precision across wider listening angles.
• K-771 Tweeter with Extended Phase Plug: A new patented extended phase plug equalizes acoustic path lengths across the compression driver diaphragm, reducing high-frequency phase cancellations for cleaner, more natural treble reproduction and a broader horizontal sweet spot.
• K-33-E 15" Folded Horn Bass System: A 15-inch fiber-composite woofer in a patented fully enclosed folded horn enclosure delivers bass extension to 34Hz with the efficiency and dynamic authority of a horn design at a fraction of the equivalent unfolded horn cabinet volume.
• 103 dB Sensitivity: Among the highest sensitivity ratings of any commercially produced three-way floorstanding loudspeaker, enabling full-volume listening with single-digit watt amplifiers including flea-power single-ended triode designs.
• Optional Heritage Active Crossover Ready: A redesigned rear I/O panel with passive input, active input, and passive output enables seamless integration with the optional Klipsch Heritage Active Crossover for tri-amplified DSP operation without cabinet modification.
• Fully Enclosed Low-Frequency Horn: Unlike earlier Klipschorn designs that required corner placement to complete the bass horn with room boundaries, the AK7's self-contained folded horn enclosure provides greater placement flexibility in a wider range of listening rooms.
• Book-Matched Real Wood Veneer: Each cabinet is finished with book-matched veneer from the same timber, available in American Walnut, American Auburn, and Black Ash, with a gray mesh grille cloth maintaining the speaker's vintage aesthetic.
• Handcrafted in Hope, Arkansas: Every Klipschorn AK7 is built to order by Klipsch craftsmen in Hope, Arkansas, the site of Paul W. Klipsch's original 1946 workshop, using domestic and imported components.
• 10-Year Warranty: Klipsch backs the full Heritage Series, including the AK7, with a 10-year warranty covering defective materials and workmanship.

Technical Specifications

Awards and Critical Recognition

• The Absolute Sound named the Klipschorn one of "The 12 Most Significant Loudspeakers of All Time"
• TONEAudio Masterpiece Award (Klipschorn Heritage Series)
• Stereophile: "No one with a taste for realistic playback, and especially no one with a taste for low-power amps and high-sensitivity speakers, should miss a chance to hear these." — Art Dudley

Frequently Asked Questions

What is the Klipschorn AK7?

The Klipschorn AK7 is the seventh major iteration of the Klipschorn, a three-way fully horn-loaded floorstanding loudspeaker from Klipsch (Hope, Arkansas, USA) and the longest continuously produced loudspeaker in audio history. First introduced in 1946, the AK7 is the current production version, featuring the K-1133-HP 3-inch compression driver, the K-406M Tractrix midrange horn with Mumps technology, the K-771 tweeter with extended phase plug, and the K-33-E 15-inch folded horn woofer. It delivers 103 dB sensitivity, a 34Hz to 19kHz frequency response, and 120 dB maximum SPL, and is sold individually in American Walnut, American Auburn, and Black Ash finishes.

How does the Klipschorn AK7 compare to the Klipsch Jubilee or Wilson Audio Alexx V?

The Klipschorn AK7 and the Klipsch Jubilee share the same Heritage Series horn-loaded philosophy but differ meaningfully in architecture and scale. The Jubilee is a two-way fully horn-loaded design with dual 12-inch woofers, a 7-inch titanium compression driver, an included external DSP crossover, and sensitivity of 107 to 110 dB, placing it above the AK7 in output capability and phase coherence. The AK7 uses a three-way passive crossover as standard, with an optional active crossover upgrade, and reaches 103 dB sensitivity from a significantly smaller and lighter cabinet at 260 lbs versus the Jubilee's 408 lbs per speaker. Compared to the Wilson Audio Alexx V, which is a conventional dynamic speaker with a passive crossover and substantially lower efficiency, the AK7 offers fundamentally greater dynamic headroom per watt and is a better match for low-power tube amplification. The Alexx V provides different strengths in imaging precision and room adaptability at smaller room scales.

Does the Klipschorn AK7 require corner placement?

No, the Klipschorn AK7 does not require corner placement. Earlier generations of the Klipschorn relied on room corners to complete the bass horn loading, using the two adjacent walls as physical extensions of the folded horn enclosure. The AK7 features a fully enclosed low-frequency horn that is self-contained within the cabinet, allowing it to develop its rated 34Hz bass extension without corner reinforcement. This significantly expands placement flexibility compared to vintage Klipschorn models and opens the AK7 to listening rooms where corner placement is not practical or acoustically desirable.

What is Tractrix horn geometry and Mumps technology?

Tractrix is a mathematically derived horn profile in which the rate of cross-sectional expansion from throat to mouth follows a specific curve that minimizes internal reflections and produces a smooth, controlled dispersion pattern with low harmonic distortion. Klipsch has used Tractrix geometry across its Heritage Series to optimize midrange and high-frequency horn performance. Mumps technology is a complementary innovation that adds small asymmetric protrusions to the exterior of the horn mouth, correcting the diffraction effects that cause irregular frequency response at the horn's edges. Together, Tractrix geometry and Mumps technology in the AK7's K-406M midrange horn produce more consistent frequency response across a wider listening angle than previous exponential horn profiles used in earlier Klipschorn generations.

Can the Klipschorn AK7 be used with low-power tube amplifiers?

Yes, the Klipschorn AK7 is one of the most tube-amplifier-friendly speakers commercially available. At 103 dB sensitivity and 8 ohms nominal impedance, the AK7 produces concert-level output from amplifiers rated as low as 1 to 5 watts per channel, making it fully compatible with single-ended triode designs using 300B, 2A3, or 45 output tubes. The AK7's consistent 8-ohm impedance across its operating range also avoids the impedance swings that can cause frequency response errors with output-transformer-coupled amplifiers. The optional Heritage Active Crossover enables tri-amplification, which allows even lower-powered amplifiers to be used by eliminating passive crossover power loss and tailoring each amplifier to its specific driver's impedance and power requirements.

What is the optional Heritage Active Crossover and is it worth adding?

The optional Klipsch Heritage Active Crossover is a dedicated DSP unit tuned specifically for the Klipschorn AK7 by Roy Delgado, Klipsch's principal acoustician and protégé of founder Paul W. Klipsch. It replaces the AK7's internal passive crossover network by dividing the audio signal at line level before amplification, applying precise phase alignment, time delay correction, and per-driver EQ. The result is a measurably flatter frequency response, improved phase coherence across the three drivers, and the ability to use separate amplifiers for each of the three frequency bands through tri-amplification. The AK7's rear I/O panel includes both passive and active inputs along with a passive output, making the crossover an optional upgrade that can be added at any time without any modification to the speaker cabinet itself.

Where can I buy the Klipschorn AK7 in Toronto or Canada?

The Klipschorn AK7 is available at Vinyl Sound in Toronto, Canada. Vinyl Sound is an authorized Klipsch Heritage dealer, one of a limited number of certified retailers in Canada qualified to carry and support the full Klipsch Heritage Series. The AK7 is built to order in Hope, Arkansas, and prospective buyers in Toronto and across Canada are encouraged to contact Vinyl Sound directly to discuss finish options, lead times, delivery logistics, and optional Heritage Active Crossover configuration before placing an order.

How does the AK7 differ from the previous Klipschorn AK6?

The Klipschorn AK7 introduces several meaningful acoustic upgrades over the AK6 from 2018. The midrange compression driver has been upgraded from the AK6's 2-inch K-55-x driver to the new K-1133-HP 3-inch unit, increasing diaphragm area by a full inch for greater sound pressure output at the horn throat. The midrange horn has been updated to the K-406M Tractrix design with Mumps technology, replacing the previous exponential horn for smoother dispersion and more consistent frequency response. The tweeter's new extended phase plug reduces high-frequency phase cancellations that the AK6's driver was subject to. The rear I/O panel has been redesigned and relocated, and the AK7 adds active input and passive output terminals that the AK6 did not include, enabling optional Heritage Active Crossover integration without any retrofitting.