GROUND-SHAKING BASS — A 15-inch front-firing driver and 300W RMS Class D amplifier fill even large rooms with deep, dynamic low end: down to 20Hz and up to 116dB, felt as much as heard in every movie night and listening session. MUSIC INTEGRITY ENGINE — KEF's DSP with iBX Intelligent Bass Extension analyzes the signal in real time, delivering bass that stays deep, accurate, and controlled at any listening level — quiet late-night viewing or full volume. SEALED CABINET, FLEXIBLE PLACEMENT — The sealed design keeps bass tight and placement easy, while three room-position EQ modes tune output for free-standing, wall, or corner placement in seconds. CONNECTS TO ANY SYSTEM — LFE/RCA and speaker-level inputs with a variable 40–140Hz crossover pair this home subwoofer with any AV receiver, soundbar, or stereo amplifier; add the KW1 adapter for wireless subwoofer freedom. SET IT AND FORGET IT — Auto wake-up, Always On, and 12V trigger power modes keep it ready when the music starts. The largest model in the Kube range: 20.4 x 19.7 x 20.3 inches and a solid 60.6 lbs, built to anchor a serious home theater.