Related Links
Documentation

LF21N401

WOOFER

The LF21N401 is a high power handling and efficiency transducer specially designed to provide powerful and accurate sub-bass frequencies with low distortion and low power compression. With a fast time response, the LF21N451 uses a fiber loaded cone assembly along a large triple roll surround. This combination provides emarkable strength and control. Double silicon spider system ensures excellent control during large excursions. A fully optimized 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.

 

Applications
  • • The LF21N401 is ideal in applications where ultra-light weight, high BL and power handling are required.
  • • Perfect for powerful lows in horn loaded sub bass systems or reflex designs.
Part Number
  • • 11100120
Features
  • 4.0 - inch Inside/Outside copper voice coil
  • 3000 Watt continuous program power handling
  • 98.0dB Sensitivity
  • 25Hz - 1kHz Frequency range
  • Dual-forced air ventilation for minimum power compression
  • Dual spider designed with silicon based damping control
  • BL of 27.6 T/m to provide a faster and accurate low frequency
General Specifications
  • Nominal Diameter: 530 / 21 mm/inch
  • Rated Impedance: 8 Ω
  • Program Power: 3000 W AES
  • Power handling capacity: 1500 W AES
  • Sensitivity: 98 dB
  • Frequency Range: 25 Hz ÷ 1000 Hz
  • Effective Piston Diameter: 470 / 18.5 mm/inch
  • Max Excursion Before Damage (peak to peak): 60 / 2.36 mm/inch
  • Minimum Impedance: 6.9 Ω
  • Voice Coil Diameter: 100 / 4.0 mm/inch
  • Voice Coil Material: Copper
  • Voice Coil Winding Depth: 31 / 1.22 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
  • Resonance frequency: 30 Hz
  • DC resistance: 5.0Ω
  • Mechanical factor: 6.8
  • Electrical factor: 0.40
  • Total factor: 0.37
  • BL Factor: 27.6 T · m
  • Effective Moving Mass: 434318 g
  • Equivalent Cas air load: 374 liters
  • Effettive piston area: 0.122
  • Max. linear excursion (mathematical): 11.4 mm
  • Voice - coil inductance @ 1kHz: 1.7 mH
  • Half-space efficiency: 2.50%
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: 219 / 8.62 mm/inch
  • Volume occupied by the driver: 6.5 / 0.229 liters/ft³
  • Net Weight: 8.8 / 19 kg/lbs
Shipping information
  • Shipping weight: 10 / 22 kg/lbs
The data are not binding; RCF reserves the right to modify the data at any time and without previous notice.