The KEF KUBE 8b delivers deep, powerful bass from a compact sealed cabinet with 300 W Class D amplification. KEF’s iBX (Intelligent Bass Extension) algorithm extends bass depth dynamically, unlocking the full potential of the custom 8″ driver at all listening levels.
Configuration is straightforward with LFE, line-level, and speaker-level inputs, phase selection, and three DSP-controlled EQ settings to match the subwoofer to any room placement. As KEF designs, engineers, and assembles driver, cabinet, and circuitry in-house, the amplifier and driver are perfectly matched for accurate, controlled bass.
| Driver Size | 8″ (200 mm) |
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| Amplifier | 300 W Class D |
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| Frequency Range | 34 Hz – 140 Hz |
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| Inputs | LFE, line-level, speaker-level |
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| DSP EQ | 3 settings |
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| Cabinet | Sealed |
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| Power Consumption | 300 W |
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| Standby Power | <0.2 W |
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