This bundle comes with 1 Alpine KTA-200M Mono 400-Watt Power Pack Amplifier and 2 Alpine W10S4 10-inch Single 4 Ohm Subwoofers. Alpine KTA-200M Amplifier: The Alpine KTA-200M is a compact amplifier designed for use behind Alpine's iLX-W650 receiver, utilizing PowerStack technology for a space-saving solution. With a size of 7" W x 1.5" H x 3.5" D, it effectively enhances your sound system while occupying minimal space. The amplifier doubles its power to 400 watts using Alpine's DPP technology, adapting to dynamic music passages for optimal performance. It features CTA-2006 compliance, a Class D amplifier circuit with Dynamic Peak Power, and various sound controls for customizing your audio experience. Key Features: - Fits behind Alpine's iLX-W650 receiver - PowerStack capable - Dynamic Peak Power technology - 200W x 1 RMS at 4Ω - 400W x 1 DPP at 2Ω - Voltage adapting input circuit - Sound controls for tailored audio Alpine W10S4 Subwoofers: The Alpine W10S4 subwoofers feature a 10-inch size, single 4Ω configuration, and polypropylene and mica cone with poly-foam surround for lasting durability. With 250W RMS and 750W peak power handling, these subwoofers deliver powerful sound. The frequency response of 30Hz-200Hz ensures a wide range of audio, while the optimized magnet circuit enhances efficiency and bass control for an impactful audio experience. Key Features: - 10-inch subwoofers - Polypropylene and mica cone - 250W RMS, 750W peak power - 30Hz-200Hz frequency response - Optimized magnet circuit for efficiency - Recommended sealed box volume: 0.83 cu. ft. - Recommended ported box volume: 1.51 cu. ft. Get ready to elevate your car audio system with this premium bundle, featuring a high-performance amplifier and subwoofers that deliver impressive sound quality and bass. Upgrade your listening experience with Alpine's top-notch technology and engineering.