LF21N401
WOOFER
  • 4.0 - inch Inside/Outside copper voice coil
  • 3000 Watt continuous program power handling
  • 98.0dB Sensitivity
  • 25Hz - 1kHz Frequency range
  • 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
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.

Part Number:

  • 11100120
    LF21N401
    8ohm
Specifications
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 Winding Material:
Copper
Voice Coil Length:
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
Shipping informations
Package Depth:
605 mm / 23.82 inches
Package Height:
605 mm / 23.82 inches
Package Weight:
10 kg / 22.05 lbs
Package Width:
585 mm / 23.03 inches
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
.