• KEF SP3940BA Kube10b 300w Active Subwoofer

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    • Overview
    • Specifications & manuals
    • Legendary service
    • Delivery, services & returns
    • Questions & answers

    Overview

    Feel, as well as hear, the earth-shuddering bass created by the KEF Kube10b Subwoofer, adding potent low tones to your audio that elevates it to new heights. With an unassuming design it would be easy for the Kube10b 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 ten inch driver, the Kube10b is optimal for filling larger 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 Kube10b 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.

    Specifications & manuals

    key Specifications
    Brand
    KEF
    Finish Colour
    Black
    Height (mm)
    370 mm
    Width (mm)
    353 mm
    Depth (mm)
    370 mm
    Model Number
    Kube10b
    Weight (kg)
    17.4 kg
    Accessories included
    Power Cable, User Manual
    warranty
    Manufacturer Warranty
    2 Years
    Warranty Note
    5 Years Warranty on Driver. 2 Year Warranty on all other components
    Use
    Not intended or designed for commercial use.
    audio
    Speaker Channels
    1
    Frequency Response Range
    24 - 140
    Maximum Output
    111 dB
    Subwoofer Power
    300
    Subwoofer Size
    10
    additional Dimensions
    Package Dimensions (H x W x D)
    498 x 487 x 483
    Package Weight (kg)
    17.43

    Legendary service

    The Appliances Online Net Promoter Score (NPS) is based on feedback from 89,897 people, collected between August 2024 to August 2025. Learn more about the Net Promoter Score (NPS).
    Greatest shopping experience ever
    Jenny and Colin, Moruya Heads, NSW
    Great prices, easy to use and prompt service.
    Erica,
    Drivers have been helpful, courteous & knowledgeable
    Sandra, Nambour, QLD

    Delivery, services & returns

    Appliances Online is all about legendary service. We offer free next business day delivery, free connection, free removal and free recycling, and we even offer Saturday delivery and, in some locations, a Premium Delivery option that allows you to choose your own 2-hour delivery window.

    Questions & answers

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