RCF LF21N551 21" 2000watts 8ohm NEO Loudspeaker

The LF21N551 is a very high power handling 21" neodymium woofer. The combination of a 3600 Watts power handling and a minimum weight of 13.7 kg makes this transducer a unique product in his category. The transducer design is based on a very strong neodymium magnetic structure and a new 5.3" inside-outside copper coil. The new Dual forced design provide an excellent heat dissipation and lower power compression. Special air-forced ventilations are provided for voice coil, magnet assembly and basket. 

The combination of carbon fibre loaded cone assembly, large triple roll surround, double silicon spider provides to the LF21N551 remarkable strength and best control under large excursion conditions. A fully optimised T-pole design generate the minimum amount of flux modulation offering a peak to peak excursion of 72 mm. The waterproof body cone treatment and polycotton curround ensure a durable performance in every application. 

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Specifications:
Nominal Diameter 530 / 21mm / inch
Rated Impedence 8 ohms
Program Power 3000 W AES
Power Handling Capacity 1500 W AES
Sensitivity 98.5 dB
Frequency Range 30Hz/1000Hz
Effective Piston Diameter 470 / 18.5mm/inch
Max Excursion Before Diameter (peak to peak) 58 / 2.28 mm/inch
Minimum Impedance 7.1 ohms
Voice Coil Diameter 115 / 4.5mm/inch
Voice Coil Material Copper
Voice Coil Winding Depth 34 / 1.33mm/inch
Number of Layers 2
Kind of Layer inside/outside
Top Plate Thickness 15 / 0.6mm/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 ohms
Mechanical Factor 6
Electrical Factor 0.27
Total Factor 0.26
BL Factor 34.5 T m
Effective Moving Mass 315g
Equivalent Cas air load 375 liters
Effettive piston area 0.173m²
Max. linear excursion (mathematical) 13.2mm
Voice - coil inductance @ 1kHz 3.0mH
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
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