Refurbished Subwoofers

Refurbished KF92 Subwoofer

  • Limited offer
  • £1,800
  • Regular price £2,250
Tax included.

Twin 9-inch force-cancelling active subwoofer

KF92 is a compact, room-friendly subwoofer engineered to deepen every listening experience.

Two massive 9-inch drivers in a force-cancelling configuration are powered by an immense 1000 Watts (RMS) of power. Optimised with KEF's Music Integrity Engine™, KF92 delivers astonishing levels of deep and controlled bass.

Guaranteed KEF quality

Each KEF Certified Refurbished Product undergoes a rigorous certification process to ensure both performance and quality are up to our exacting standards. They are also covered by the same warranty terms and conditions as our new products.


Discover The Detail In The Deep

To reproduce serious bass you need a completely different kind of loudspeaker, one which can cope with huge pressure. KF92 is engineered to blast out huge chunks of lower frequency energy, yet is subtle enough to pick out the delicate details of a double bass. KF92 ensures you don't just feel the air move - you feel the sound move you.
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Perfect balance

Two 9-inch drivers are positioned back to back in a force-cancelling design which cancels out the reactive forces which stress conventional subwoofers. This configuration keeps KF92 perfectly balanced so all you'll hear is deep and clean bass at sound pressure levels of upto 110db.
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Effortless dynamics

KF92's prodigious drivers are optimised with a clever vented design which reduces viscous drag on the movement of the cone, ensuring they can keep up with even the most demanding impulses.
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Bespoke bass

Two 9-inch KEF transducers were conceived specifically for the KF92. They feature a hybrid aluminium/paper cone and an oversized motor system and voice coil. They offer vanishingly low distortion and precision, so every bass moment is uncovered even when they are working at extremes.
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Music Integrity Engine™

KEF's research into digtal sound processing - Music Integrity Engine - is the brains behind KF92. Intelligent Bass Extension optimises the relationship between the amplifier, drivers and cabinet, while placement-dependant EQ allows for seamless integration into any room.
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Turn up the power

KF92’s 1000W (RMS) of Class D amplification (500W RMS per driver) creates immense power., delivering incredible levels of control. This improves timing accuracy and dynamic response, producing a more detailed sound closer to that in the studio.
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More bass, less space

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.
The Details


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Dimension (H x W x D) With Rear Panel and Feet
352.5 x 330 x 360.5mm
20 Kg
Force cancellation
Drive Units
2x9" drivers
Variable Low Pass Filter
40Hz – 140Hz, LFE
RCA phono sockets
Speaker level inputs
Power Consumption
Power Requirements
100-240 V, 50/60 Hz
Maximum Output
Frequency Response (-3db)
11Hz - 200Hz
Amplifier Type
Built-in Class D
Amplifier Power
1000W RMS (2 x 500W RMS)
KEF reserves the right, in line with continuing research and development, to amend or change specifications. E&OE.


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"The KF92 delivers performance which quite simply defies its modest dimensions." -, Sept. 2022

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"This smartly styled subwoofer reaches deep in a manner that's at odds with its size, and does so with a deftness that's rarely heard when delivering bass this seismic." - SPRING 2022, ISS. 330


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Customer Reviews

Based on 1 review
Christopher Meenan (Chessington, GB)
Refurbished KF92

I didn't have any subs beforehand, but had a set of R11s. The R11s sounded great, but I found that it was only on specific tracks I was getting the depth of bass that really made me smile. I happen to spot reconditioned KF92 on the Kef website so I thought, why now !

I've had them a couple of weeks now, and am still playing with the setup, but they are absolutely amazing. The sound from the R11s with these subs is totally transformational. The bass has real depth and almost a texture to it. Also, the overall sound stage is greatly improved, somehow the mids/highs even sound clearer. Obviously songs with strong base sound (and feel !) amazing e.g. After Midnight (Hanna Boel), Angel (Massive Attack), Brothers In Arms (Dire Straits). But even those without strong base have a new depth e.g. Mrs Robinson (Simon and Garfunkel), Where do the children play (Cat Stevens).

I've connected them to the speak level connection (so a feed from the back of the R11s to the KF92s) and the subs pretty much sit beside the R11s. I've set the x-cross over frequency to 60Hz which is giving a super clear sound and a crisp and punchy bass

Initially I had one of the subs set to phase shift of 180, but I realised that was causing a lot of base dips throughout the room, so I put them both to zero and how its nice an even throughout. I guess its just due to my positioning of them...

I'm finding that I'm re-listening and re-discovering my entire music collection now.. Everything just sounds so much better..

Also I should say the small form factor, just about, got the OK from my wife.... It was a close one though :)

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