• RMS 400 watts
• Dual 2 or 4 ohm voice coils
• Optimized for small, sealed enclosures
• Lightweight Neodymium motor
• Computer-optimized foam “w” surround
• Two-inch 8-layer copper voice coil
• Large aluminum Faraday ring for smooth acoustic response
• Patented high strength cast aluminum frame
• Low distortion motor construction
• High-temperature voice coil wire
• Spring-loaded terminals
• Stitched-on tinsel lead wires

The SD-4 series truly is a world-class sound quality woofer with low mounting depth, small box requirements, yet extraordinarily high power handling. It's the ideal choice for anyone seeking a high-quality, low-mounting-depth subwoofer that performs hammers in small enclosures. With enhanced mechanical durability and superb sound quality, you get the perfect marriage of form and function.