Boss S120AP 12" 1400W 4-Ohm Bass System Amplified Subwoofer Enclosure Install Kit THE THREE KEY ELEMENTS NEEDED TO MAKE BASS IN YOUR SYSTEM ARE A SUBWOOFER, AN ENCLOSURE, AND A POWER AMPLIFIER. BOSS ENGINEERS HAVE RESEARCHED, DESIGNED, AND BUILT THE IDEAL COMBINATIONS OF THOSE ELEMENTS IN THESE SYSTEMS. TO COMPLETE THE PACKAGES WE PROVIDE THE WIRING KITS NEEDED TO COMPLETE THE INSTALLATION. 12-inch subwoofer; External MonoBlock MOSFET power amplifier; Remote subwoofer level control Frequency response: 20-200Hz; Impedance: 4 ohms; Sensitivity: 92dB RMS power: 700 watts; Max power: 1400 watts