







Kube 10b Subwoofer
10-inch bass driver active 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 10b features a 10" bass driver powered by a 300 watt RMS bespoke class D amplifier and 3 custom EQ settings for easy placement.

The Kube 10b 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.

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.

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.

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.

The Kube 10b 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.

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.

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.

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.
Customer Reviews
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Very Musical sub with the big caveatVery musical sounding sub blends very nicely and easily with my bowers and Wilkins. But there’s one big problem, it only turns on with high volumes. If you’re listening to say 70-73 db volumes which I usually do it shuts off.
Was reading about this on other places and contacted kef customer service as well but they did not have any help with this. Only other option was using the lfe input. But for me, I wanted to use it with speaker level input.
So if you’re listening to over 80db volumes it’s fine but if it’s around 70db or around it’s not gonna work.
Another thing is with really higher volumes which we rarely do listen to, it gets a bit boomy.Posted on
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Great Sound at a great priceAfter talk to tech support I opted for 1 Kube 10b and it is fantastic. I paired this with the Sat Pack 205 and it’s a great match for my open concept theater room.
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Excellent Speaker! Perfect Addition!Got a KUBE 10b to connect with a pair of LSX speakers. An excellent combination !
They're great! Fast and accurate, without sounding boomy, bloated or tubby.
No matter what sort of music I run through them, they respond!
From movie sound tracks to extreme orchestral music, like Mahler or Shostakovich, to Wagnerian opera and organ music, they handle everything well.Posted on
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Most musical sub!I have a larger, more powerful subwoofer from another manufacturer in my main system. I needed a more compact one for my office setup, to augment my KEF LS50's. I'm shocked at the quality of this unit's sound. It's fast attack and rapid decay is rare in a sub at this cost level, making it a bargain. It absolutely pounds me when asked, keeping right up with the LS50's in seamless harmony. I now want to replace the one on my main system with it's bigger brother, the Kube 12b!
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Great speakerThis review is for the Kube2. Excellent base response and customization options. Side firing speaker opens up a lot more possibilities for locating speaker in the room
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Write Your Own Review
Model | Kube10b Subwoofer |
DESIGN | Powered Subwoofer |
DRIVE UNITS | 1 x 250mm (10in.) |
FREQUENCY RANGE | 24 to 140Hz (±3dB) |
MAXIMUM OUTPUT | 111dB |
AMPLIFIER TYPE | Built-in Class-D |
AMPLIFIER OUTPUT POWER | 300W RMS |
VARIABLE LOW PASS FILTER | 40Hz - 140Hz & LFE |
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) 370 x 353 x 370mm (14.6 x 13.9 x 14.6in.) |
WEIGHT | 17.4kg |
** KEF reserves the right, in line with continuing research and development, to amend or change specifications. E&OE. **

KUBE 10b Subwoofer in 5.1 Speaker Review |
"These speakers have little trouble blistering through the trigger-happy car chase of the opening scenes - they use every ounce of their muscle to pin us back into the sofa.” |
Year: 2017 |
Magazine / Issuing Body: What Hi*Fi? |
Country of Publication: United Kingdom |
Product: KEF Q350 Bookshelf Speaker Pair, Q650c Center Channel, KUBE10b Subwoofer |
KUBE 8b/10b/12b Brochure | Download |
KUBE 8b/10b/12b Product Manual | Download |
KUBE 8b/10b/12b Subwoofer Information Sheet | Download |
KUBE 10b Subwoofer Product Drawing | Download |
KUBE 10b Subwoofer CAD Drawing | Download |
KUBE 10b Subwoofer + KW1 Product Drawing | Download |
KUBE 10b Subwoofer + KW1 CAD Drawing | Download |