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RCF LF21N551 - 21" 2000W 8 Ohm
THIS ITEM IS END-OF-LINE AND DUE TO BE PHASED OUT
If it is not showing in-stock, please email us to double-check the availability.
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.
Applications :
The LF21N551 is ideal in applications where combinations of maximum power handling, light weight and ultra fast time response are required.
Perfect for powerful lows in horn loaded sub bass systems or reflex designs. Ideal for touring, find a perfect application in high power, heavy duty, club subwoofer systems.
This product has been discontinued - please do not try to order this item we will not be able to supply it - the product details are here for reference only. Please contact a member of staff, and we may be able to find an equivalent product for you.
General Specifications
- Nominal Diameter: 530 mm / 21 inch
- Rated Impedance: 8 Ohms
- 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 mm / 18.5 inch
- Max Excursion Before Damage (peak to peak): 58 mm / 2.28 inch
- Minimum Impedance: 7.1 Ohms
- Voice Coil Diameter: 115 mm / 4.5 inch
- Voice Coil Material: Copper
- Voice Coil Winding Depth: 34 mm / 1.33 inch
- Number of layers: 2
- Kind of layer: inside / outside
- Top Plate Thickness: 15 mm / 0.6 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: 315 g
- Equivalent Cas air load: 375 litres
- Effecttive 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 mm / 21.5 inch
- Bolt Circle Diameter: 527 mm / 20.7 inch
- Bolt Hole Diameter: 6.5 mm / 0.25 inch
- Front Mount Baffle Cut-out: 512 mm / 20.1 inch
- Rear Mount Baffle Cut-out: 512 mm / 20.1 inch
- Depth: 250 mm / 9.8 inch
- Volume occupied by the driver: 6.5 litres / 0.229 ft³
- Net Weight: 10.9 / 24 kg/lbs
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