With an ultra-shallow enclosure design and powerful sound output, the R-Series Shallow Preloaded Subwoofer Enclosures give you the best of both worlds in size and sound. Features: Optimal sealed cabinet quality Aluminum Dust Cap Neodymium Magnet Alpine Gen2 DD Linear Magnetic Circuit CARB compliant ¾” MDF construction Premium Alpine embroidered black carpet Alpine-branded terminal cup Pre-installed steel mesh grille Includes a 10” R-Shallow Subwoofer (RS-W10D4) Rubber, modular stackable foot design What's in the Box: Sealed Cabinet with (1) 10” R-Series Shallow Subwoofer Mounting Brackets Owner’s Manual Warranty Information Online product registration information Tech Specs: Dimensions: 21.15” W x 5.25” H x 16” L 600W RMS Power Handling Frequency response: 29Hz – 200Hz Dual 4Ω voice coils wired in parallel for a 2Ω load (compatible with S-A60M or R-A75M) Nominal Impedance: 2Ω Voice Coil: 4”(101.6mm) Designed for Tight Spaces Now you don’t have to choose between bass and space! Alpine’s R-Series Shallow Preloaded Subwoofer Enclosure measures at a minimal 5.25” deep to deliver a loud and fun sound in most vehicle applications. Rubber “feet” are adjustable in height to accommodate uneven vehicle floors. Extreme Output Don’t let the size fool you – the enclosures feature the same motor movement (20MM of 1-way excursion) as the full-size R2-Series Subwoofers for extreme output in a shallow woofer design. At the heart of the R-Series Shallow Subwoofers is an oversized 4-inch voice coil that houses the lightweight and powerful neodymium magnet for 600W RMS of power handling.