RCF L18P400 Professional Car and DJ Low Frequency 18-Inch Transducer 2000 Watt continuous program power handling 97.5 dB Sensitivity 4-inch, fibreglass inside-outside copper voice coil 2000 Watt continuous program power handling 97.5 dB Sensitivity 25 Hz - 1 kHz Frequency range Aluminum demodulation ring Forced air ventilation and 14 mm top plate for minimum power compression Dual spider design with silicon based dampening control Triple-roll surround and corrugated straight cone geometry