Velodyne - DD-15 - Digital Drive - Subwoofer - 15 Inch - Gloss Black THX Ultra2 Certified Patented ERS 'Class D' power amplifier, 1250 watt RMS / 3000 watt Dynamic Remote control with six custom presets, night mode Driver: 15" forward firing Kevlar-reinforced resin (12.7" piston diameter) Frequency response: 15 Hz - 120 Hz +/- 3 dB