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KUBE 12b Subwoofer

Discover sound’s hidden depths with KEF Kube subwoofers. The Kube unleashes explosive power intelligently thanks to iBX technology that extends bass depth dynamically. Delivering immersive music and home theatre sounds that drive you deeper into the heart of the performance.

The Kube 12b features a 12" bass driver powered by a 300 watt RMS bespoke class D amplifier and 3 custom EQ settings for easy placement.
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Product Features
Explore new dimensions in sound with Kube, KEF’s powerful range of subwoofers that open up sound’s hidden depths.

Each elegantly designed, fully sealed unit unleashes explosive power effortlessly, intuitively, intelligently. iBX technology extends the bass depth dynamically, unlocking the full potential of the driver’s power at normal listening levels or even the most extreme. And with KEF’s unique capability to design, build and integrate the driver in-house, we take optimisation to a whole new level. Delivering immersive music and home theatre sounds that drive you deeper into the heart of the performance.
KEF KUBE Subwoofer Line
KEF Kube Subwoofer FrontImmersiveness

Go deep or go home. KEF’s design and engineering team worked in chorus to develop iBX. This Intelligent Bass Extension algorithm creates an extended depth that unlocks the full potential of the custom driver. Giving you unparalleled precision and ultimate synchronicity between amplifier, driver and sealed cabinet.
Easy configuration

Your room, your rules. Kube subwoofers offer unmatched flexibility in configuration. With a range of LFE, line & speaker-level inputs, Phase selection and 3 DSP controlled EQ settings to help match your sub to any room placement, you’re in control right out of the box. Set up the Kube where it’s most convenient to you, match it to any main speaker or with any type of music system and start exploring new depths in your sound.
KEF KUBE Subwoofer Control Panel
KEF Kube Subwoofer IntegrationIntegration

We’re on the same page. KEF is quite possibly the only high-end manufacturer who designs, engineers and assembles the driver, cabinet and circuitry in-house. This level of integration is the hallmark of our commitment to pure sound and the Kube stays true to that ideal. What you get is a driver and amplifier so perfectly attuned they sing in absolute harmony.
Features • 56bit 50 MIPS DSP preamplifier • iBX Intelligent Bass Extension • KEF smartConnect intelligent inputs automatically detect mono or stereo and adjust the subwoofer volume level accordingly • Sealed for greater accuracy and delicate musical detail while allowing the Kube subwoofers to be installed in a cabinet • Placement tuning presets for: Free standing, Wall/in-cabinet and Corner • 300Watt Class D amplifier with DSP preamplifier/EQ

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Model Kube12b Subwoofer
DESIGN Powered Subwoofer
DRIVE UNITS 1 x 300mm (12in.)
FREQUENCY RANGE 22Hz - 140Hz (±3dB)
ANALOGUE INPUT RCA phono sockets
Speaker level inputs
POWER REQUIREMENTS 100V - 120V / 220V - 240V ~ 50 / 60Hz
DIMENSIONS (with Rear panel and feet / H x W x D)
410 x 393 x 410mm (16.1 x 15.5 x 16.1in.)
WEIGHT 20.6kg

** KEF reserves the right, in line with continuing research and development, to amend or change specifications. E&OE. **

Press and Awards
KEF KUBE12b EISA Best Product 2018-2019 Home Theater Speaker System
KUBE12b EISA Home Theater Speaker System Best Product 2018/2019 Award
Year: 2018
Magazine / Issuing Body: EISA
Country of Publication: United Kingdom
Product: KUBE12b Subwoofer

KEF KUBE12b Review & Award Best Subwoofer 2018 Sound and Vision
KUBE12b Review & 5-Star Bass: Best Subwoofers of 2017/2018 Award
"Reviewed as part of KEF’s 5.1.4 Dolby Atmos-enabled Q Series system, the Kube12b received high praise from veteran reviewer Mark Fleischmann, who gave the 12-inch/300-watt subwoofer 5 stars for Performance and Value. He was particularly enamored with how the sub handled the “thunderous” pipe-organ blast on Vaughan Williams’ Job/Symphony No. 9 (Chandos SACD). “I’m impressed by how much performance KEF got out of the $700 price of the Kube12b sub,” Fleischmann wrote. “A legend has to be earned. KEF continues to earn it.”
Year: 2018
Magazine / Issuing Body: Sound and Vision
Country of Publication: United States
Product: KUBE12b Subwoofer

KEF KUBE12b Subwoofer Review from AVS Froum
KUBE12b Review & 2018 Top Choice Award
“In the past, KEF may not have been on your radar when it comes to affordable high-performance subs. But competition among subwoofer makers is fierce and now things are different. For delivering something close to the ideal “living room sub” at its size and price point, I’m giving the KEF Kube 12b a well-deserved AVS Forum “Top Choice 2018” award."
Year: 2018
Magazine / Issuing Body: AVS Froum
Country of Publication: United States
Product: KUBE12b Subwoofer
KEF KUBE12b Subwoofer Review from AVS Froum

KEF KUBE12b Subwoofer Review from Hi-Def Digest
KUBE12b Review
“Outside of the budget-busting (for me, at least) $1700 R400b, I've never been a huge fan of KEF's more affordable subwoofers, but that all changes with the KUBE 12b. Powered by a 300w Class D amp and custom circuitry, the 12b punches above its class and capabilities, producing deep, buttery bass perfect for those who love to FEEL music and movies."
Year: 2018
Magazine / Issuing Body: High-Def Digest
Country of Publication: United States
Product: KUBE12b Subwoofer
KUBE 8b/10b/12b Subwoofer Information Sheet Open In New Window

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