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  1. Subwoofers

KEF Kube8b

9,3/10 (23 reviews)
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KEF subwoofers
  • KEF Kube8b Main Image
  • KEF Kube8b right side
  • KEF Kube8b back
  • KEF Kube8b detail
  • KEF Kube8b product in use
  • KEF Kube8b Main Image
  • KEF Kube8b right side
  • KEF Kube8b back
  • KEF Kube8b detail
  • KEF Kube8b product in use
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Similar and better products

  • Current product
  • 549,-
  • 740,-
Frequency range
  • 34 - 140 Hz
  • 20 - 140 Hz
Speaker sensitivity
  • 105 dB
  • 90 dB
Subwoofer type
  • Wired
  • Wired
View full comparison

Product information

Key specs

Subwoofer type
Wired
Frequency range
34 - 140 Hz
Speaker audio crossover
1-way
Speaker sensitivity
105 dB
View all specifications

Pros and cons

According to our subwoofer expert
  • The small size makes the subwoofer ideal for small spaces.
  • Enjoy clear and deep bass sounds, thanks to the frequency range of 34 to 140Hz.
  • Thanks to the power of 300 watts, you can listen to a powerful bass.
  • The subwoofer isn't wireless.
  • Audio cables aren't included.
Product Expert subwoofers

Description

The KEF Kube8b is a small but powerful active subwoofer. Because the subwoofer is only 29 centimeters wide and high, you can easily place it in or on a cupboard. This makes it suitable for installation in small living rooms. The subwoofer delivers a fast, clear bass that brings out different music styles and movie sounds. The low frequencies stand out even better thanks to the closed housing. With the wide range of various inputs and settings you can easily adjust the subwoofer to any placement in the room. Combine the subwoofer with speakers and a center speaker for a home cinema experience.

The KEF Kube8b is a small but powerful active subwoofer. Because the subwoofer is only 29 centimeters wide and high, you can easily place it in or on a cupboard. This makes it suitable for installation in small living rooms. The subwoofer delivers a fast, clear bass that brings out different music styles and movie sounds. The low frequencies stand out even better thanks to the closed housing. With the wide range of various inputs and settings you can easily adjust the subwoofer to any placement in the room. Combine the subwoofer with speakers and a center speaker for a home cinema experience.

Included by default

  • Manual

Included by default

  • Manual

Key specs

Subwoofer type
Wired
Frequency range
34 - 140 Hz
Speaker audio crossover
1-way
Speaker sensitivity
105 dB
View all specifications

Complete your purchase

Reviews

23 reviews
9,3/10 (23 reviews)

Rating

2 reviews with 5 stars

0 reviews with 4 stars

0 reviews with 3 stars

0 reviews with 2 stars

0 reviews with 1 star

Customer images

Most helpful reviews

9,0/10

Very tight subwoofer

  • Nice and sleek design
  • Easy to connect
  • Not really
  • Reinder hoekstra
  • 9 May 2019
  • Automatically translated from Dutch
0,0/10

Very good addition to the Kef LS50

  • very musical
  • DSP settings
  • 12" remains a large square box in your living room
  • Rd
  • 5 May 2020
  • Automatically translated from Dutch
0,0/10

absolute top subwoofer

  • Beautiful design
  • tight full bass
  • dust collector
  • John
  • 10 July 2020
  • Automatically translated from Dutch
0,0/10

Excellent compact addition for kef ls50

  • Stylish appearance
  • Easy to place by DSP for difficult positions
  • Ten inches goes deeper and fuller
  • Albert
  • 5 January 2021
  • Automatically translated from Dutch
0,0/10

Super Sub

  • Great sound
  • Beautiful design
  • No
  • Laurens rijff
  • 13 June 2019
  • Automatically translated from Dutch
0,0/10

Solid and not too big

  • Easy to connect
  • Not too big
  • dust magnet
  • Wouter
  • 10 May 2020
  • Automatically translated from Dutch
0,0/10

Positive experience

  • Enough volume for living room.
  • Auto standby
  • Wim sikma
  • 22 July 2021
  • Automatically translated from Dutch
0,0/10

recommended for bass heads

  • Produces very tight bass
  • high KEF "built quality"
  • a bit more expensive
  • Hugo
  • 3 June 2020
  • Automatically translated from Dutch
0,0/10

It costs a bit, but then you REALLY get something...

  • warm tones of music
  • impressive audio for surround action films
  • the neighbours...
  • Pascal
  • 22 October 2023
  • Automatically translated from Dutch
0,0/10

Make my kef lsx sound better

  • good sound
  • not too big
  • only in black
  • Remco greve
  • 18 July 2021
  • Automatically translated from Dutch
9,0/10

Very tight subwoofer

  • Nice and sleek design
  • Easy to connect
  • Good sound quality
  • Not really

I bought the Kef Kube 10B for an extra experience during film and music. And this subwoofer has that experience.

I've had the Kef Kube 10B for a little over a week now and I'm very satisfied with it. Very good bass, even at lower volumes.

The design is very sleek. The subwoofers have a fabric-covered cabinet and on the top of the subwoofer is a black glass plate with the logo on it

  • Reinder hoekstra
  • 9 May 2019
  • Automatically translated from Dutch
0,0/10

Very good addition to the Kef LS50

  • very musical
  • DSP settings
  • Bargain for what you get
  • 12" remains a large square box in your living room

I was looking for a subwoofer to complement the Kef LS50. The LS50 is an extremely good loudspeaker for the price, when combined with a good amplifier and cabling. However, you miss low below 50Hz.

First bought the B&W PV1D because of the reviews, but it was difficult to get it working together. Sent it back (Coolblue is so easy!!) and tried the Kef Kube 12b, again because of the reviews. I was a bit hesitant, considering that it costs half the B&W, but it fits together wonderfully.
There are heavier subs available for movies, but for music this is really spectacular. You don't hear that a sub is on, but when you turn it off, the sound becomes thin.

DSP settings work great. It's in a corner of our living room, which is far from ideal. But the DSP on corner and everything is right again.

  • Rd
  • 5 May 2020
  • Automatically translated from Dutch
0,0/10

absolute top subwoofer

  • Beautiful design
  • tight full bass
  • very surprised by the deep low
  • dust collector

Normally I wouldn't think of KEF with a subwoofer, but this is an absolute top subwoofer. Nice tight deep bass, without being intrusive. Really good sound for both music and movies.
Easy to connect. Preset eq settings for different placement. Excellent combination with KEF LS50. Highly recommended!

  • John
  • 10 July 2020
  • Automatically translated from Dutch
View all 23 reviews

Insure your subwoofer

You can select one of the Backup Plans below in your shopping cart. It will protect your brand new subwoofer against damage and/or theft.

KEF Kube8b
  • 3-year Backup Plan
    42,99 one-time payment
  • 5-year Backup Plan
    69,00 one-time payment

Specifications

Product

Product number
807642
Manufacturer code
SP3939BA
Brand
KEF
Warranty
2 years
Processing of your defect
Via Coolblue
Old product returned for free
Yes

General properties

Subwoofer type
Wired

Subwoofer properties

Active speaker
Yes
Continuous/nominal total output capacity (RMS)
300 W
Speaker sensitivity
105 dB
Frequency range
34 - 140 Hz
Speaker subwoofer diameter
200 mm
Bass reflex port
No

Audio connectors

Speaker connector accepts cable type
Speaker wire, Stereo RCA cable (RCA), Subwoofer cable (RCA)
Digital optical connector
No

Physical properties

Color
Black
Depth
31 cm
Width
29,3 cm
Height
29,3 cm
Weight
11,3 kg
Material
Plastic

Awards

Best tested
No

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