KEF Kube 8b Subwoofer Speaker

KEF Kube 8b Speaker

The KEF Kube 8b is a compact, sealed powered subwoofer designed to deliver deep, controlled bass without taking up much space. It features an 8″ long-throw driver driven by a 300 W RMS Class-D amplifier, augmented by KEF’s Intelligent Bass Extension (iBX) DSP to dynamically enhance low-end output. With a frequency response reaching down to 34 Hz, adjustable crossover (40–140 Hz), phase switch, and placement presets (free-standing, cabinet, corner), it integrates seamlessly into music, home theater, or gaming systems. Its minimalist design and sealed enclosure make it ideal for small-to-medium rooms, offering impactful bass performance from a compact footprint (293 × 293 × 310 mm, 11.3 kg).

Key Features:

• Design: Sealed 8″ powered subwoofer

• Amplifier: 300 W RMS Class-D with iBX DSP

• Frequency Response: 34 Hz – 140 Hz (–6 dB)

• Max Output: ~105 dB SPL

• Inputs: RCA/LFE and speaker-level

• Controls: Variable low-pass (40–140 Hz), phase switch (0°/180°), gain knob

• Placement Modes: Free-standing, cabinet, corner

• Dimensions: 293 × 293 × 310 mm; weight ~11.3 kg

• Power Supply: 100–240 V universal

• Use Cases: Ideal for small rooms, desktop setups, compact home theaters