The very Stromg magnetic unit & # 44; With 15 mm thick plates and specially designed for suspensions to guarantee excellent amplitude control of more than +/-12 millimeters. The special cooling system with forced air ventilation offer high haet dissipation and the lowest power compression levels available on the market. Voice coil & # 44; Suapensions and cone construction materials have been updated in order to support up to a RMS power of kW). The L18P300 finds its best application in both bandpass and bass reflex systems. Its ability to reproduce extremely low frequency along with extraordinary definition make it a woofer of no compromise in its category & # 44; Ideal for both live and recording music. 4" & # 44; fiberglass inner/copper outer voice coil. 2000W continuous program power handling. 97dB sensitivity. Frequency range 35Hz – 1.5KHz. Forced air ventilation and top plate 15mm for minimum compression power. Dual damping control Spider web design with silicone base. M-roll surround geometry and exponential cone. Nominal diameter: 460/18. Nominal impedance: 8 O. Program power: 2000 W AES. Power Handling Capacity: 1000 W AES Sensitivity: 97 dB Frequency Range: 35 Hz ÷ 1000 Hz Effective Piston Diameter: 380 mm/15." Max excursion before damage (peak to peak): 40mm/1.6". Minimum impedance: 6.0 O. Voice coil diameter: 100/4. Voice coil material: Copper. Voice coil winding depth: 23mm/0.9. " Number of layers: Indoor/Outdoor. Layer Type: 2. Top Plate Thickness: 15mm/0.6". Cone Material: No Cut Pulp. Cone Design: Curved. Surround Material: Polycotton. Surround Design: M - Roll. Thiele/Small Parameters: Frequency. resonance: 33 Hz DC resistance: 5.0o Mechanical factor: 8.3 Electrical factor: 0.34 Total factor: 0.33 BL factor: 23.5 T m Effective mass in movement: 180 g. Equivalent CAS Air charge: 226 liters. Effective area of piston: 0.113 m². Max. excursion (Math): 7.8 mm linear. Voice coil, 1 kHz inductance: 1.9 MH. half-space Effi