Boss 15" Dual 4-Ohm Voice Coil Subwoofer: * Power peak: 2500W * RMS: 1500W * Cone material: Poly-injection * Voice coil size and type: 2-1/2" * Efficiency 1W/1M: 96dB * Frequency response: 25Hz-1kHz * Impedance: dual 4-ohm * Mounting depth: 7-1/8"