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.
The Kube 12b effortlessly unleashes explosive power. iBX technology dynamically extends bass depth and KEF’s unique ability to design, build and integrate the driver in-house takes optimisation to a whole new level. Delivering immersive music and home theatre sound that takes you to the heart of the performance.
Immersiveness
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
Kube subwoofers offer unmatched set up flexibility. A range of LFE, line and speaker-level inputs, phase selection and DSP controlled EQ settings help you get the best from a Kube. Put it in a convenient position, match it to any main speaker or type of music system, and start exploring new depths in the sound.
DESIGN
Integration
KEF is quite possibly the only high-end manufacturer that designs, engineers and assembles the driver, cabinet and circuitry in-house. This level of integration means we are commited to pure sound and the Kube stays true to that ideal. The result is a driver and amplifier that are perfectly in tune.
SOUND
Hear new dimensions in sound with Kube subwoofers
The Kube 12b effortlessly unleashes explosive power. iBX technology dynamically extends bass depth and KEF’s unique ability to design, build and integrate the driver in-house takes optimisation to a whole new level. Delivering immersive music and home theatre sound that takes you to the heart of the performance.
Immersiveness
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
Kube subwoofers offer unmatched set up flexibility. A range of LFE, line and speaker-level inputs, phase selection and DSP controlled EQ settings help you get the best from a Kube. Put it in a convenient position, match it to any main speaker or type of music system, and start exploring new depths in the sound.
DESIGN
Integration
KEF is quite possibly the only high-end manufacturer that designs, engineers and assembles the driver, cabinet and circuitry in-house. This level of integration means we are commited to pure sound and the Kube stays true to that ideal. The result is a driver and amplifier that are perfectly in tune.
I was able to get one of these added into our newly finished basement theater. It sounds great! I will admit, at first, I was that kid that wanted everything to sound bassy, and the house to move on every note; so I was slightly disappointed when the Marantz AVR did its calibration setup, and had the subs (using an old Sony sub on the right side) at lower levels. It didn't rock the house on every note! So... I turned those channels up, only to find that I really didn't want to hear that much bass in everything. I took it back down to the calibrated settings again, and put the crossover at 60, and watched an action movie. The house moved when it needed to, It sounds and feels great!!! One movie that really moved me was "T-34", a tank movie. Previously serving in the Army, that movie took me back to my days as a tanker. It was great!! The "FEEL" of the shots, impacts, droning engine, tracks, etc, was so realistic!! This sub gave me exactly what I needed.
And yes, at some point I will replace the old Sony sub, to make a Kef 12b duo. It looks classy too.
Review byColorado Mike
Posted on
Sound quality is outstanding, and flat BELOW 20 HZ!
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Quality
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I'm currently running dual KEF Kube 12b subs and could not be happier. I think their sound quality is outstanding, and they'll play flat BELOW 20 HZ! They perform better than their specs say they should, with many other products it's the opposite. If you're looking for a subsonic subwoofer for music and home theater, you should check the KEF Kube 12b out. I think it's a truly incredible buy.
Review byawhaley
Posted on
Hands down the best relatively compact sub
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I was looking for a relatively small sub for my medium sized basement home theater. I needed some extra low end reach for my Goldenear Triton Three speakers and surrounds. The KEF fits the bill perfectly, even the matches the look with the gloss top and fabric sides. The KEF is an understated sub that does not draw much attention, which is good for the decor and spouse approval. As for performance, it is unbelievable! Now movies and music have some extra depth (but not bloat) from the Kube 12b. The real world measurements are impressive. In my room, I can get a FLAT corrected EQ curve to 15Hz at about 75db from Anthem Room Correction, WOW! I did a head to head with an SVS SB 2000 and the Kube12b produced 7-8db louder response from 15-25 Hz which is exactly where I want more output. The corrected sub EQ curve for the SVS tailed off at about 18 Hz. Needless to say I kept the KEF. This is the best relatively compact sub hands down that won't overwhelm a room with its size!
Review bymark
Posted on
Best bang for buck subwoofer on the market
Price
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Quality
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If you're looking at KEF then you're probably seeking a certain type of sound quality. You're looking for responsive and tight audio that scales with volume and sounds cleaner than a space satellite construction room. My one concern going into this was that for the $500-$700 range, you wouldn't find a tight and powerful subwoofer as you only start to experience that in the $1200+ range. KEF has surprised me here! The subwoofer remains clean and tight throughout the range without any one frequency droning louder. It has sleek looks to match the quality bass sound.
I do wish there was a phase dial rather than a 0-180 switch but that's a small concern and shouldn't affect those with ample placement options. I have 2 places that I can put the sub so the sweet spot is off by a few feet but it's not a big deal because it still sounds great. The only reason I am giving this subwoofer a 4/5 for sound quality is because I have heard KEF's Reference 8b subwoofer and wish this sounded a bit more like that. The build quality and value for dollar is excellent though which is why my recommendation is 5/5.
I went to this from an SVS SB-2000 and think this sounds miles better.
Cheers and happy listening!
Review byArthur
Posted on
Fantastic
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I added this subwoofer to the KEF LS50 W series. Although the LS50W doesn't need a subwoofer, adding it has made a great sound even more enhanced. The sound is rich, deep, but it is very clean. It balances very nicely and is controlled by the KEF app. It is the type of sound that once you experience it, you cannot go back and listen to music without it. Well made, it lives up to the KEF reputation.
"Watching the standard Blu-ray version with 5.1 sound, the KEFs grabbed on and wouldn't let go. From the roar of the engines to the synthesizer-heavy score, they kept my attention riveted.”
Year: 2019
Magazine / Issuing Body: Sound and Vision
Country of Publication: United States
Product: KUBE12b Subwoofer
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
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
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
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."
