PRV Audio 18FH2400 18" Folded Horn Pro Audio Subwoofer 8 Ohm The perfect folded horn subwoofer High 1,200 watt RMS power handling and 7 mm of Xmax Cast aluminum, 4-spoke frame and spring-loaded terminals Dual spider suspension and cotton M-Roll surround for driver linearity 4&quot; voice coil motor with extreme ventilation for minimum power compression