PRV AUDIO 18SW2500 18" High Power Pro Audio Subwoofer 8 Ohm Better than other subwoofers that cost twice as much! High 1,250 watt RMS power handling and 8 mm of Xmax Cast aluminum, 8-spoke frame and spring-loaded terminals Dual spider suspension and cotton M-Roll surround for driver linearity 5&quot; voice coil motor with extreme ventilation for minimum power compression