RCF LF21N451, Woofer 21", 1500 Watt RMS / 8 Ohm

The LF21N451 is a very high power handling and efficiency transducer specially designed to provide powerful and accurate sub-bass frequencies with low distortion and low power compression. Ultra fast time response. The LF21N451 uses a fibre loaded cone assembly along a large triple roll surround, this combination provides remarkable strength and control. Double silicon spider system ensures excellent control during large excursions. A fully optimised T-pole design generate the minimum amount of flux modulation. The Dual-forced air venting system provides a very efficient voice coil ventilation to minimize the power compression.

Features: 4,5 - inch Inside/Outside copper voice coil 3000 Watt continuous program power handling 98.5dB Sensitivity 30Hz - 1kHz Frequency range Dual-forced air ventilation for minimum power compression Dual spider designed with silicon based damping control BL of 34.5 T/m to provide a faster and accurate low frequency

Specifications: Nominal Diameter: 530 / 21 mm/inch Rated Impedance: 8 Ohm Program Power: 3000 W AES Power handling capacity: 1500 W AES Sensitivity: 98.5 dB Frequency Range: 30 Hz ÷ 1000 Hz Effective Piston Diameter: 470 / 18.5 mm/inch Max Excursion Before Damage (peak to peak): 58 / 2.28 mm/inch Minimum Impedance: 7.1 Ohm Voice Coil Diameter: 115 / 4.5 mm/inch Voice Coil Material: Copper Voice Coil Winding Depth: 34 / 1.33 mm/inch Number of layers: 2 Kind of layer: inside / outside Top Plate Thickness: 15 / 0.6 mm/inch Cone Material: No pressed pulp carbon fiber reinforced Cone Design: Curved Surround Material: Polycotton Surround Design: Triple roll

Thiele/Small Parameters: DC resistance: 5.6 Ohm Mechanical factor: 6 Electrical factor: 0.27 Total factor: 0.26 BL Factor: 34.5 T · m Effective Moving Mass: 315 g Equivalent Cas air load: 375 liters Effettive piston area: 0.173 m² Max. linear excursion (mathematical): 13.2 mm Voice - coil inductance @ 1kHz: 3.0 mH Half-space efficiency: 4.0%

Mounting information: Overall Diameter: 547 / 21.5 mm/inch Bolt Circle Diameter: 527 / 20.7 mm/inch Bolt Hole Diameter: 6.5 / 0.25 mm/inch Front Mount Baffle Cut-out: 512 / 20.1 mm/inch Rear Mount Baffle Cut-out: 512 / 20.1 mm/inch Depth: 250 / 9.8 mm/inch Volume occupied by the driver: 6.5 / 0.229 liters/ft³ Net Weight: 10.9 / 24 kg/lbs