KEF Kube 8b Subwoofer 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).