KEF KC92 Powered Subwoofer with Dual 9" Force-Canceling Drivers Compact yet robust, the KC92 subwoofer features 2 x 9-inch force-cancelling drivers propelled by a formidable 1000W (RMS) of amplification. Optimized with KEF's Music Integrity Engine®, KC92 subwoofer delivers remarkably deep and impactful bass with exceptional precision, bringing you an immersive, ultra-dynamic listening experience. Product Highlights: Frequency response: 11-200 Hz (±3 dB) Built-in Class D amplifiers deliver 1,000 watts RMS (500 watts for each woofer) Dual force-canceling 9" woofers in back-to-back configuration Hybrid paper/aluminum cones with pressure-resistant "P-Flex" surround material for fast, accurate response Compact, acoustic suspension (sealed) cabinet design iBX (Intelligent Bass Extension) digital signal processing provides deep, dynamic bass at any listening level Music Integrity Engine (MIE) leverages custom digital signal processing algorithms to provide optimal, accurate bass response 5 ro