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KEF KC92 Powered subwoofer with dual 9" force-canceling drivers (Black Gloss)

Item # 991KC92BL

This high-tech powered subwoofer delivers titanic levels of clean, driving bass without taking up a ton of floor space.

This high-tech powered subwoofer delivers titanic levels of clean, driving bass without taking up a ton of floor space.

Item # 991KC92BL

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About the KEF KC92

Kramer Crane

KEF's bass acumen on full display

KEF is beloved by hi-fi enthusiasts worldwide — including plenty of us here at Crutchfield — for their innovative approach to cabinet and driver design. Their high-tech KC92 powered subwoofer reflects years of British audio expertise, pairing a compact, stylish enclosure with dual 9" woofers for titanic bass.

KEF's bass acumen on full display

KEF is beloved by hi-fi enthusiasts worldwide — including plenty of us here at Crutchfield — for their innovative approach to cabinet and driver design. Their high-tech KC92 powered subwoofer reflects years of British audio expertise, pairing a compact, stylish enclosure with dual 9" woofers for titanic bass.

KEF KC92 powered subwoofer (cutaway view)

The KC92 use a force-canceling design with dual 9" woofers to deliver deep, distortion-free bass.

Force-canceling design for better clarity

The drivers are cleverly arranged in a force-canceling, back-to-back configuration that reduces noise and vibration, while KEF's proprietary Music Integrity Engine® ensures rich, dynamic bass with albums and movie soundtracks. Pair the KC92 with any of KEF's loudspeakers for a potent stereo or home theater experience.

My time a with KEF sub has been stellar

A few years ago I bought the smaller sibling of this sub, the KC62, to pair with the LS50s in my small home office. I still can't get over how dense and inert that little sub's cabinet feels. Bass from music and video games is tight, clean, and hard-hitting.

According to KEF, the KC92 plays at volumes up to 110dB, about twice as loud as my smaller sub. I heartily recommend the KC92 if you have a medium- to large-sized listening room. And I suggest adding the optional KW1 wireless adapter kit if running a signal cable proves challenging. I'll note here that this subwoofer does not come with grilles. Instead, it uses color-matching cones that complement the enclosure's attractive finish.


Product highlights:

  • frequency response: 11-200 Hz (±3 dB)
  • built-in Class D amplifiers deliver 1,000 watts RMS (500 watts for each woofer)
  • dual force-canceling 9" woofers in back-to-back configuration
  • hybrid paper/aluminum cones with pressure-resistant "P-Flex" surround material for fast, accurate response
  • compact, acoustic suspension (sealed) cabinet design
  • iBX (Intelligent Bass Extension) digital signal processing provides deep, dynamic bass at any listening level
  • Music Integrity Engine (MIE) leverages custom digital signal processing algorithms to provide optimal, accurate bass response
  • 5 room position presets help you dial in optimal bass for your sub's location
    • Room, Wall, Corner, Cabinet, and Apartment modes
  • compatible with KEF's KW1 wireless subwoofer adapter kit for flexible placement
  • variable low-pass crossover (40-140 Hz)
  • phase control switch (0°/180°)
  • line-level/LFE RCA and speaker-level inputs
  • line-level output with selectable, adjustable high-pass filtering
  • USB-C input for firmware updates
  • detachable power cord
Dimensions and warranty:
  • 13"W x 13-15/16"H x 14-1/4"D
  • weight: 44.1 lbs.
  • warranty: 5 years woofer, 2 years amplifier
  • MFR # KC92BL

What's in the box:

  • Powered subwoofer
  • 6.5' AC power cord
  • Speaker-level input block
  • User Manual
  • Important Safety Information
  • Warranty Information

Customer reviews for KEF KC92

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More details on the KEF KC92

Stacey B.

Features & specs

Enclosure Sealed
Woofer Size (inches) 9
Woofer Composition Not given
Firing Direction Side
Amplifier Output (watts) 1000
Frequency Response 11-200 Hz
Preamp-Level Inputs Stereo RCA/LFE
Speaker-Level Inputs Phoenix
Speaker-Level Outputs No
Wireless Optional
Low-Pass Crossover Freq 40-140
High-Pass Crossover Freq 40-120
Phase Switch Yes
App Control No
Remote No
Other Info
Height (inches) 13-7/8
Width (inches) 13
Depth (inches) 15-3/16
Weight 44.1 lbs
Speaker Parts Warranty 5 Years
Speaker Labor Warranty 5 Years
Amplifier Parts Warranty 2 Years
Amplifier Labor Warranty 2 Years
The KEF KC92 replaces these items:

Product Research


Force-Canceling Configuration: Two 9" drivers are positioned back to back in a force-canceling configuration which cancels out the reactive forces, minimizing cabinet vibration and relieving stress on the drivers, for optimal accuracy and greater detail than conventional subwoofers. This configuration keeps the KEF KC92 perfectly balanced so all you'll hear is deep and clean bass at sound pressure levels of up to 110db.

  • Dual 9" Drivers: The two 9" drivers are custom-designed specifically for the KC92. Their hybrid structure, with a shallow, concave aluminum skin atop a paper cone, boasts a substantial motor system and a vented design in the voice coil. This design achieves linearity and vanishingly low distortion, ensuring every detail is uncovered regardless of volume. With optimized excursion characteristics, the KC92 achieves depths of 11Hz for exceptionally low dynamic bass response. Its clever vented design which reduces viscous drag on the movement of the cone, ensuring they can keep up with even the most demanding impulses.
  • P-Flex Surround: The woofer's P-Flex Surround is engineered to better resist the acoustic pressure in the cabinet to allow the driver to move more precisely compared to traditional surround designs. Incorporating KEF's patent-pending P-Flex Surround, inspired by the Japanese art of Origami, this unique design resists acoustic pressure without compromising sensitivity. The pleated structure, akin to Origami folds, resists internal air pressure, allowing the woofer to move precisely as dictated by the audio signal. The result is a deeper bass extension and more accurate, detailed bass reproduction.

Compact Sealed Enclosure: The compact, sealed box construction improves flexibility of positioning as well as the speed and clarity of performance. The beautiful low profile heatsink ensures that the hard working electronics are kept in an optimum thermal condition.

Note: No grilles are included.

Class D Amplification with Music Integrity Engine: The KC92's audiophile-quality 1000W of Class D amplification (a dedicated 500W amplifier for each driver) creates immense amounts of power, filling almost any domestic space. The two dedicated Class D amplifiers also deliver incredible levels of control, which improves timing accuracy and dynamic response, for a more detailed sound, closer to that heard in the studio. An integrated low-profile heatsink ensures that the high-performance amplifier and electronics are kept in optimum conditions.

Music Integrity Engine (MIE): KEF’s Music Integrity Engine MIE) is a proprietary suite of in-house written DSP (Digital Signal Processing) algorithms, serving as the mastermind behind the detailed and accurate bass sound of their powered subwoofers. Tailored specifically for each model, this ensures that every component works in perfect harmony to an even higher level than would otherwise be possible. Intelligent Bass Extension (iBX) optimizes the relationship between the amplifier, drivers and cabinet, while placement-dependant EQ allows for seamless integration into any room.

  • Intelligent Bass Extension (iBX): Part of KEF’s acclaimed Music Integrity Engine (MIE), Intelligent Bass Extension (iBX) analyzes the input signal and applies customized Digital Signal Processing (DSP) to optimize the relationship between the amplification, drivers and cabinet. As a result, KC92 can play deeper and with a greater handling of dynamics, no matter how quiet or loud you are listening
  • Placement Dependent EQ Section: The KC92's MIE suite of DSP algorithms also features a powerful placement-dependant EQ section. Flexible positioning allows for seamless integration of the KC92 into any environment, from corner placement to cabinet-housing, and even apartment living.

Rear-Panel Controls: Rear-panel controls (consisting of Volume Level, LPF/HPF crossovers, Phase and EQ Presets) help match the powered sub to your speaker system and room placement.

  • Volume Level: The volume control adjusts the output level of the subwoofer in relation to the main loudspeakers.
  • Placement Tuning Presets: There are 5 placement tuning presets so the powered subwoofer sounds great no matter where you position it. You can choose from Room (by front speakers), Wall (side wall), Corner (corner wall), Cabinet (inside a cabinet), or Apartment (reduces output level of and frequency below 40Hz)
  • Phase Control: The phase control will normally be set at 0°, but more output level can sometimes be achieve in the 180° position; in particularly when the subwoofer is far away from your main loudspeakers.
  • LPF Crossover: The low-pass frequency (LPF) crossover frequency control changes the upper cut-off frequency of the subwoofer. Its effective range is from 40Hz to 140Hz at a rate of 24dB per octave. The frequency control should be adjusted to achieve the smoothest integration and transition between the main loudspeakers and the subwoofer.
  • HPF Crossover: The high-pass frequency (HPF) crossover is assigned to the powered sub's line-outputs and is used to match the KC92's frequency response to your speakers that are powered by a separate amplifier. You can set the HPF crossover between 40 and 120Hz, or it can be bypassed.

Note: There is a "Mode" switch on the rear panel which allows you to manually adjust the powered sub's low-pass crossover or bypass the sub's crossover; depending on if your AV receiver or integrated amplifier has a built-in LFE crossover.

Connectivity: The KC92 powered sub provides LFE, line-level, and speaker-level inputs to connect to a variety of AV receivers and integrated amplifier. KEF's smartConnect intelligent LFE and line-level inputs automatically detect a mono or stereo signal and adjusts the subwoofer volume level accordingly. It also provides a line-level output to daisy-chain the audio signal to another powered subwoofer.

  • LFE (Low Frequency Effect): The Left line-level input can be used as a LFE input and connected to your AV receiver's LFE output. In this setup, your receiver's built-in crossover settings will be utilized instead of the the powered sub's. Make sure the sub's crossover is set to "LFE".
  • Line-Level Inputs: If your receiver or integrated amplifier is not equipped with a LFE output but does have line-level outputs, you can use the powered sub's stereo line-level inputs to connect the subwoofer to your receiver or integrated amp.
  • Line-Level Outputs: The stereo RCA line-level outputs can be used to daisy-chain the LFE, Line-Level, or Speaker-Level input of the KC92 to another powered subwoofer. Or, it can be used to connect a separate amplifier that is powering your loudspeakers.
  • Speaker-Level Inputs: The speaker-level input consists of a detachable phoenix-block connector. These speaker-level inputs connect to the main speaker-level outputs of your receiver or integrated amplifier which is not equipped with an LFE out or line-level outputs.

Optional Wireless Adapter: The KEF KW1 Wireless Subwoofer Adapter (sold separately) allows you to wirelessly transmit the low-frequency audio signal from your AV receiver, preamplifier, integrated amp, or powered speakers to the KC92 powered sub. The KW1 Wireless Subwoofer Adapter consists of a wireless transmitter (TX) and wireless receiver (RX). The KEF KW1 provides a high-quality wireless transmission that delivers every ounce of detail and impact from your movie and music soundtracks. The KW1 operates in the high-bandwidth 5GHz RF band with an auto-selectable digital wireless link of 5.2GHz or 5.8GHz. It delivers a wireless audio signal up to 24-bit/48kHz that is near lossless with a low-latency of less than 17ms. The KW1 has a wireless range of approximately 49' (15M). Pairing is intuitive and simple with a pairing button on the transmitter and receiver. Simply, press both buttons to pair the two devices.

  • Transmitter (TX): The KW1's wireless receiver features a set of stereo RCA jacks that allow for connection to your AV receiver's, preamplifier's, integrated amp's, or powered sub's subwoofer/LFE output. The wireless transmitter does not come with its own power supply and receives its power via USB. You'll need an external USB/AC power adapter (sold separately - see Accessories Tab) or an AV receiver, preamplifier, integrated amp, or powered speakers with a USB (5V/1A) charging port to power the wireless receiver. The wireless receiver can simply be placed on top of your component or on a shelf next to your component.
  • Receiver (RX): The KEF KW1's wireless receiver simply plugs into the KEF KC92 powered sub's proprietary "Expansion" port to receive its wireless audio signal from the system's wireless transmitter. The proprietary "Expansion" port on the KC92 subwoofer also powers the wireless receiver (no external AC adapter or USB port required). Once the wireless receiver is plugged into the "Expansion" port, it is secured to the back of the powered sub by the included screws.

Note: The KEF KW1 Wireless Subwoofer Adapter comes with only one wireless receiver, but can support up two wireless receivers for a wireless connection of up to two KEF KC92 powered subs. An additional KW1-RX wireless receiver is available and sold separately.

Power Requirements: The KC92 comes with a 6.5" AC power cord (IEC 3-prong) that will plug into the back of the powered sub and into an AC wall outlet or surge protector/line-conditioner (sold separately). You can select from 3 power modes to suit any system requirement. The 12V Trigger mode provides automatic wake-up when connected devices are turned on, while the Music Sense mode allows the KC92 to wake up from standby when an audio signal is detected, plus an Always On mode that ensures the subwoofer is primed and ready to play immediately.

Placement Options: As the bass (low-frequency) sound produced by the subwoofer is non-directional it can be positioned almost anywhere in the room, although it should not be placed too close to the listener. Because the KC92 is side-firing, it should be positioned at least 3" from any wall.

Firmware Updates: The KEF KC92 powered subwoofer features a rear-panel USB-C port which enables convenient firmware updates for future enhancements.

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