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  • RCF LF21N551 21" 8 Ohm Driver (Email for Availability)

RCF LF21N551 21" 8 Ohm Driver (Email for Availability)

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$997.97
$997.97
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Features


  • 5.3 - inch Inside/Outside copper voice coil
  • 4000 Watt continuous program power handling
  • 97 dB Sensitivity
  • 30 Hz - 1 kHz Frequency range
  • Dual-forced air ventilation for minimum power compression
  • Dual spider designed with silicon based damping control
  • BL of 39 Txm to provide a faster and accurate low frequency



The LF21N551 is very high power handling 21” neodymium woofer. The combination of a 3600 Watt 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 surround ensure a durable performance in every application.



PART NUMBER:

  • 11100076 
  • LF21N551 
  • 8ohm 



SPECIFICATIONS 

NOMINAL DIAMETER: 21 inch / 533 mm

RATED IMPEDANCE: 8 ohm

PROGRAM POWER: 4000 W

POWER HANDLING CAPACITY: 2000 W

SENSITIVITY: 97.0 dB

FREQUENCY RANGE: 30 - 1000 Hz

EFFECTIVE PISTON DIAMETER: 470 mm / 18.5 inch

MAX. EXCURSION BEFORE DAMAGE: 72 mm / 2.83 inch

MINIMIM IMPEDANCE: 7.1 ohm

VOICE COIL DIAMETER: 5.3 inch / 135 mm

VOICE COIL WINDING MATERIAL: Copper

VOICE COIL LENGTH: 39 mm / 1.54 inch

NUMBER OF LAYERS: 2

KIND OF LAYERS: inside/outside

TOP PLATE THICKNESS: 18 mm / 0.71 inch

CONE DESIGN: Curved

SURROUND MATERIAL: Polycotton

SURROUND DESIGN: Triple roll

MAGNETS: Neodymium

DUAL-FORCE AIR VENTILATION: Yes

SPIDER: Dual with silicon based damping control



Thiele-Small (T/S) Parameters  

RESONANCE FREQUENCY (FS): 35 Hz

 DC RESISTANCE (RE): 5.20 ohm

 MECHANICAL FACTOR: 6.20 Qms

 ELECTRICAL FACTOR (QES): 0.35 Qes

TOTAL FACTOR: 0.33 Qts

 BL FACTOR (BL): 39.00 Tx m

 EFFECTIVE MOVING MASS (MMS): 434.0 g

 EQUIVALENT CAS AIR LOADED (VAS): 200.0 liters

 EFFETTIVE PISTON AREA (SD): 0.170 m2

 MAX. LINEAR EXCURSION (XMAX): 15.0 mm

 VOICE COIL INDUCTANCE @ 1KHZ (LE1K): 3.20 mH

 HALF-SPACE EFFICENCY (EFF): 2.40%



Mounting Information  

OVERALL DIAMETER: 547 mm / 21.54 inches

 BOLT CIRCLE DIAMETER: 527 mm / 20.75 inch

 BOLT HOLE DIAMETER: 7 mm / 0.28 inch

 FRONT MOUNT BAFFLE CUT-OUT: 512 mm / 20.16 inch

 REAR MOUNT BAFFLE CUT-OUT: 512 mm / 20.16 inch

 VOLUME OCCUPIED BY THE DRIVER: 7.2 liters / 0.28 ft3


Standard compliance  

CE MARKING: Yes


Size

WEIGHT: 14 kg / 30.86 lbs

 HEIGHT: 260 mm / 10.24 inches

 DIAMETER: 547 mm / 21.54 inches


Shipping informations  

PACKAGE WIDTH: 604 mm / 23.78 inches

 PACKAGE WEIGHT: 17 kg / 37.48 lbs

 PACKAGE HEIGHT: 284 mm / 11.18 inches

 PACKAGE DEPTH: 584 mm / 22.99 inches

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