Feel, as well as hear, the earth-shuddering bass created by the KEF Kube12b Subwoofer, adding potent low tones to your audio that elevates it to new heights. With an unassuming design it would be easy for the Kube12b to escape your notice, and therein lies its strength. A minimalist and elegant finish allows it to unobtrusively blend into your entertainment setup, that is, until it’s turned on.
Utilising a twelve inch driver, the Kube12b is optimal for filling smaller rooms with rich, transparent sound. For that extra bit of boom, the Intelligent Bass Extension (iBX) extends the bass depth, unlocking the true potential of the driver’s power. With KEF’s smartConnect, the input automatically detects whether it is connected to a mono or stereo system and adjusts the volume accordingly.
Your Kube12b Sub can comfortably suit any room placement thanks to a large range of configuration options. Low-frequency effects, line and speaker-level inputs, three DSP controlled EQ settings and Phase selection puts control of your audio into your hands. And with a built-in Class D amplifier, you never have to worry about whether your Kube can excel at higher volumes.
Utilising a twelve inch driver, the Kube12b is optimal for filling smaller rooms with rich, transparent sound. For that extra bit of boom, the Intelligent Bass Extension (iBX) extends the bass depth, unlocking the true potential of the driver’s power. With KEF’s smartConnect, the input automatically detects whether it is connected to a mono or stereo system and adjusts the volume accordingly.
Your Kube12b Sub can comfortably suit any room placement thanks to a large range of configuration options. Low-frequency effects, line and speaker-level inputs, three DSP controlled EQ settings and Phase selection puts control of your audio into your hands. And with a built-in Class D amplifier, you never have to worry about whether your Kube can excel at higher volumes.

ibX- Intelligent Bass Extension
If you don't have deep, rich, rumbling bass, do you really have bass? The ibX algorithm creates extended depth that unleashes the full potential of the driver, delivering detailed lower tones.

Sealed Cabinet
The sealed cabinet maintains the highest accuracy and detail of your audio, even at louder volumes. With tighter control over your low tones, each beat will sound punchy and dynamic.

Manual Crossover Adjustment
An easy-use dial allows you to adjust the Hertz range that this subwoofer can operate at. In essence, this allows a wider range of speakers to work with this unit.

Compact Design
Deceptively small, the compact construction of this unit hides its raw auditory power.


