Alpine R Series Subwoofer Packaged with a S Series Mono Amplifier R Series 10" Dual 4 Ohm Voice Coil Subwoofer - 750 Watt RMS S Series Monoblock Subwoofer Amplifier - 600W RMS x 1 @ 2 Ohms Subwoofer Specifications: Top Mounting Depth - 5.975" / Mounting Height - 0.8" / Sealed Box Volume - 0.48-0.93 Cu Ft. / Ported Box Volume - 0.83-1.38 Cu Ft. / Sensitivity - 82.8 db Amplifier Specification: 600 Watts RMS x 1 @ 2 Ohms / 330 Watts RMS x 1 @ 4 Ohms / CTA-2006 Compliant / Variable Low-Pass Filter - 50-400 Hz, 24 dB Octave / Variable Bass Boost - 0-12 dB at 50 Hz / Fuse Rating: 30A x 2 / Dimensions: 8"W x 2-1/4" H x 8"D Wiring Note - For Optimal Preformance Subwoofer Will Need to Be Wired at a 2 Ohm Final Impedance The Alpine R Series - the most recognized subwoofer ever made. Alpine's a new R Series subwoofer gives you generations of subwoofer building experience. Experience that is unmatched by any in the industry. Combined with the power packed S Series amplifier and you've got a match that will give you the ultimate package for sound quality and performance.