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KEF Kube8b Subwoofer


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Enquiry/price check? Click here SKU: KUBE8B
Ex VAT: £415.83

Kube8b is the entry-level model of KEF's Kube series of subwoofers and is the 8" alternative to the larger 10" Kube10b and flagship 12" Kube12b models.

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Condition: Brand new in original retail packaging

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Warranty length 5 Years
Brand KEF Speakers

Tech Specs

- Model: Kube8b
- Design: Powered Sub (sealed)
- Drive Units: 1 x 200mm (8”)
- Freq Response: 34Hz - 140Hz (-6dB)
- Maximum Output: 105dB
- Amplifier Type: Built-in Class D
- Amplifier Output Power: 300W RMS
- Variable Low Pass: 40Hz - 140Hz & LFE
- Analogue In: RCA phono/Speaker level
- Power: 100-120V / 220-240V ~50/60Hz
- Dimensions (HWD): 293 x 293 x 310mm
- Weight: 11.3kg

Product Description

KEF Kube8b Subwoofer is a pocket-sized subwoofer, which exceeds its compact dimensions by packing plenty of power and depth of bass. The 8" driver makes the Kube8b perfect for smaller living rooms.


iBX, developed by KEF’s design and engineering team, is an Intelligent Bass Extension algorithm which creates an extended depth that unlocks the full potential of the custom driver to give you unparalleled precision and ultimate synchronicity between amplifier, driver and sealed cabinet.

The DSP analyses your input signal and applies KEF’s iBX, allowing the subwoofer to play louder and remain dynamic at any listening level.

Easy configuration

Kube subwoofers offer unmatched flexibility in configuration. With a range of LFE, line & speaker-level inputs, Phase selection and 3 DSP controlled EQ settings to help match your sub to any room placement, you’re in control right out of the box.

Set up the Kube where it’s most convenient to you, match it to any main speaker or with any type of music system and start exploring new depths in your sound.


KEF is quite possibly the only high-end manufacturer who designs, engineers and assembles the driver, cabinet and circuitry in-house. This level of integration is the hallmark of their commitment to pure sound and the Kube stays true to that ideal. What you get is a driver and amplifier so perfectly attuned they sing in absolute harmony.

Kube Series

Each elegantly designed, fully sealed unit unleashes explosive power effortlessly, intuitively, intelligently. iBX technology extends the bass depth dynamically, unlocking the full potential of the driver’s power at normal listening levels or even the most extreme.

KEF’s unique capability to design, build and integrate the driver in-house, takes optimisation to a whole new level. Delivering immersive music and home theatre sound that drives you deeper into the heart of the performance.


KEF smartConnect intelligent inputs automatically detect mono or stereo and adjust the subwoofer volume level accordingly. Included are placement tuning presets for Freestanding, Wall/in-cabinet and Corner meaning the Kube sounds perfect wherever it’s installed.


- Formidable 56bit 50 MIPS DSP preamplifier
- iBX Intelligent Bass Extension
- Sophisticated proprietary DSP programming
- Imposing 300W Class D amp with DSP preamp/EQ

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Contact Details

UK Local Rate Number
0844 50 403 50

Sales Landline
0121 224 7300/7401

Customer Services Landline
0121 224 7350/7351

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