Cadence Acoustics Pro Series PRO10X4, 10� 800 Watt Peak Power 4 Ohm Pro Audio Subwoofer Features: RMS Power: 400 Watts PEAK Power: 800 Watts Long Life Power: 200 Watts Frequency Response: 55Hz – 4 kHz Sensitivity: 95dB @ 1w/1m SPL Impedance: 4 Ohm 2.5� / 63.5mm Voice Coil 2-Layer, Copper Wire on Kapton / Nomex Former Nickel Plated Spring Loaded Push Style Terminals Kevlar Reinforced Pulp Cone Cotton Conex with Integrated Tinsel Lead Spider