KEF Kube 12b (Black) is rated 4.2 out of 5 by 5.
  • y_2022, m_8, d_9, h_20
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.32
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_5
  • loc_en_GB, sid_KEF-KUBE-12B-BLACK, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_richersounds
  • bvseo_sdk, p_sdk, 3.2.1
  • CLOUD, getAggregateRating, 132.33ms
  • REVIEWS, PRODUCT

KEF Kube 12b (Black)

Subwoofer
£749

Disabled assistance

All products that are available to purchase on the Richer Sounds website can be delivered free to blind, partially sighted or those with a disability. Find out more

Please contact web after sales for more info.
For delivery of in-store only deals, please contact your local store for more details.
Ts&Cs apply - see our delivery page.

Disabled assistance

All products that are available to purchase on the Richer Sounds website can be delivered free to blind, partially sighted or those with a disability. Find out more

Please contact web after sales for more info.
For delivery of in-store only deals, please contact your local store for more details.
Ts&Cs apply - see our delivery page.
Compare (3 max)

Make the most of your subwoofer. View our hottest deals on sub cables and interconnects.


Monster bass meets suave good looks, with the impressive KEF Kube 12b.

iBX for awesome bass you can feel

KEF’s Kube subwoofers feature iBX (Intelligent Bass Extension) for the deepest bass from the most compact cabinets. The iBX algorithm creates an extended depth of bass that easily exceeds expectations – even for a subwoofer of this size. Backing this up is a powerful 300 watts, Class-D amplifier. This is enough to power the high quality 12" bass unit to very high levels and ultra-low frequencies. With effortless bass on tap, the Kube 12b is ideal for both movies and music.

Power, controlled
Despite its high power rating, the KEF Kube is about more than just firepower. The sealed cabinet not only offers high levels of rigidity but also gives a tight, controlled bass that's never overblown or sloppy. A 3-position DSP (EQ) control allows adjustment of the Kube's response to compensate for different room acoustics and personal preference. There's also a phase switch. This lets you reverse the phase, giving perfectly timed bass whether the sub is in front or behind you.

Effortlessly stylish
Most subs deserve to be hidden away, but not the Kef Kube! Featuring smooth lines, a wrap-around grille and gloss black top panel, the Kube 12b is one subwoofer you’ll be happy to have on display. As the flagship model, the Kube 12b is perfect for larger rooms, where its expansive sound fills out the space with ease.

Let the KEF Kube 12b take you to the extremes of bass – just don’t forget to ask the neighbours around!
Overview
Speaker Type Enclosure - Filter
Infinite baffle sealed
Audio
Crossover Frequency (Hz)
40 - 140
Driver Units
12 inch driver
Frequency Response (Hz)
22 - 140
Power Rating (Watts)
300
Features
Auto On/Off
Yes
Dimensions
Dimensions WxHxD (mm)
393 x 410 x 410mm
Weight
Weight (KG)
20.6
Rated 1 out of 5 by from Waiting fo subwoofer Ordered on 27/1/2021 still waiting on confirmation that order is on its way
Date published: 2021-02-07
Rated 5 out of 5 by from Not Just Movies But Music Shakes the Walls As Well I wanted to see if this would bring the lowest octaves to my KEF LS50 speakers which it does. With careful matching the sub is adding just to lowest 40hz down to 22hz when such material is present on a recording. Of note both the Level and Cut-Off Frequency knobs have click detents, so that it is possible to adjust with accuracy the setting of each control. Adjustment of one click up or down is repeatable. I found the Cut Off Freq two clicks up from 40hz and the Level 11 clicks up from minimum works well and matches the LF performance of my LS50 system to that of a pair of Monitor Audio Silver 500. Not mentioned anywhere that I could see is the Auto Power Down (the LED Red when Off, Green when On) which works well. The only problem I had was initially attempting to use the high level speaker inputs which induced hum. That might be my cabling, but using a Pre Amp out with a long Phono to Phono cable fixed that. I should add that I sometimes leave it switched off, the LF performance of the LS50 while light is sometimes pleasing enough. However in full flight the Kube 12 will remove windows and plaster adding serious heft to bass drum or organ music.
Date published: 2020-03-21
Rated 5 out of 5 by from Smooth and great for music! I have a pair of Kef 107 without its matching Kube equalizer. I tried using a DSP in the analog domain to correct the bass response but sound quality suffered too much. Then I tried adding a bass reflex sub and it sounded better, but the intergration was poor. The sub was too obvious, to the point of being intrusive. Decided to try out the Kef 12b since it is a sealed design. It works much better with the 107, and is now much more seamless.
Date published: 2019-01-16
Rated 5 out of 5 by from Compact and works well with my 103/3 older kef's A bit pricy but Give me more of a natural live sound than I had before, very good.
Date published: 2018-06-30
Rated 5 out of 5 by from Sleek sub Excellent sub looks very sleek and sounds amazing x
Date published: 2018-04-02
  • y_2022, m_8, d_9, h_20
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.32
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_5
  • loc_en_GB, sid_KEF-KUBE-12B-BLACK, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_richersounds
  • bvseo_sdk, p_sdk, 3.2.1
  • CLOUD, getReviews, 25.48ms
  • REVIEWS, PRODUCT

  • Representative 21.9% APR (variable)
  • Purchase rate 21.9% p.a. (variable)
  • Assumed credit limit £1,200
Subject to status. Terms and conditions apply. Richer Sounds Limited acts as a broker and offers credit solely from PayPal (Europe) S.a rl et Ice, S.C.A, 22-24 Boulevard Royal, L-2449, Luxembourg.
Klarna Payment Badge

Pay in 3 interest-free payments so you can spread the cost. No fees.

  • Add item(s) to your cart
  • Go to checkout and choose Klarna 
  • Enter your debit or credit card information.
  • To check your eligibility, Klarna will perform a soft search with a credit reference agency. This will not affect your credit score.
  • Spread the cost in 3 interest-free payments. The first payment is made at point of purchase, with the remaining 2 payments scheduled automatically every 30 days. No fees.

You must be 18+ to use this credit offer. Credit subject to status. T&Cs apply. Klarna uses soft searches with credit reference agencies. These do not affect your credit rating. Missed payments can affect your ability to use Klarna. Pay in 3 installments complete terms.

Buy now, pay later available in-store or by phone, on items over £500

We offer 6 and 10-month options.

Call your local store or our telesales team for details

For purchases over £500, you can settle the balance in 6 months, and in 10 months on purchases over £1000 and pay no interest whatsoever. If you settle part of your loan in the deferral period you won’t pay interest on that part. You can still pay off the loan sooner if you make additional payments. If you’d rather spread the cost over 36 months, you can set up a loan repayment plan when the payment-free period comes to an end at 19.9% APR representative. A one-off settlement fee of £29 will be applied. Subject to application, financial circumstances and borrowing history. Ts&Cs apply. Richer Sounds Limited acts as a credit broker and not the lender. Barclays Partner Finance acts as the lender. Find out more information and eligibility criteria here.