DEEP, DYNAMIC BASS — A 12-inch front-firing driver and 300W RMS Class D amplifier deliver powerful low end for larger rooms and dedicated home theaters: down to 22Hz and up to 114dB, felt as much as heard in every scene and song. 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. A composed 16.1 x 15.5 x 16.1 inches and 41 lbs, it anchors serious sound without commanding the room.