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.
• 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
Cone Design: Curved
Dual-force air ventilation: Yes
Effective piston diameter: 470 mm / 18.5 inch
Frequency range: 25 - 1000 Hz
Kind of layers: inside/outside
Magnets: Neodymium
Max. Excursion Before Damage: 60 mm / 2.36 inch
Minimim Impedance: 6 ohm
Nominal Diameter: 21 inch / 533 mm
Number of layers: 2
Power handling capacity: 1500 W
Program Power: 3000 W
Rated Impedance: 8 ohm
Sensitivity: 98 dB
Spider: Dual with silicon based damping control
Surround Design: Triple roll
Surround Material: Polycotton
Top Plate Thickness: 15 mm / 0.59 inch
Voice Coil Diameter: 4.0 inch / 102 mm
Voice Coil Material: Copper
Voice Coil Winding Material: 31 mm / 1.22 inch
Mounting Information
Bolt circle diameter: 527 mm / 20.75 inch
Bolt hole diameter: 512 mm / 20.16 inch
Front mount baffle cut-out: 512 mm / 20.16 inch
Overall diameter: 547 mm / 21.54 inches
Rear mount baffle cut-out: 512 mm / 20.16 inch
Volume occupied by the driver: 6.5 liters / 0.26 ft3
Size
Diameter: 547 mm / 21.54 inches
Height: 234 mm / 9.21 inches
Weight: 8.8 kg / 19.4 lbs
Standard compliance
CE marking: Yes
Thiele - small parameters
BL factor (BL): 27.60 T x m
DC resistance (Re): 5.00 ohm
Effective moving mass (Mms): 318 gr
Effettive piston area (Sd): 0.12 m2
Electrical factor (Qes): 0.40 Qes
Equivalent Cas air loaded (Vas): 374 liters
Half-space efficency (Eff): 2.50%
Max. linear excursion (Xmax): 11 mm
Mechanical factor: 6.80 Qms
Resonance frequency (Fs): 30 Hz
Total factor: 0.37 Qts
Voice coil inductance @ 1kHz (Le1k): 1.70 mH
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