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

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 LF21N401 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
Nominal Diameter:
21 inch / 533 mm
Rated Impedance:
8 ohm
Program Power (watt):
3000 W
Power handling capacity:
1500 W
Sensitivity:
98.0 dB
Frequency range:
25 - 1000 Hz
Effective piston diameter:
470 mm / 18.5 inch
Max. Excursion Before Damage:
60 mm / 2.36 inch
Minimum Impedance (ohm):
7.0 ohm
Voice Coil Diameter:
4.0 inch / 102 mm
Voice Coil Winding Material:
Copper
Voice Coil Length:
31 mm / 1.22 inch
Number of layers:
2
Kind of layers:
inside/outside
Top Plate Thickness:
15 mm / 0.59 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 parameters
Resonance frequency (Fs):
30 Hz
DC resistance (Re) (ohm):
5.00 ohm
Mechanical factor:
6.80 Qms
Electrical factor:
0.40 Qes
Total factor:
0.37 Qts
Bl factor (Bl) (T x m):
27.60 T x m
Effective moving mass (Mms):
318.0 g
Equivalent Cas air loaded (Vas):
374.0 liters
Effective piston area (Sd):
0.173 m2
Max. linear excursion (Xmax):
11 mm
Voice coil inductance @ 1kHz (Le1k):
1.70 mH
Half-space efficency (Eff):
2.50%
Mounting information
Overall diameter:
547 mm / 21.54 inches
Bolt circle diameter:
527 mm / 20.75 inch
Bolt hole diameter:
6 mm / 0.24 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:
6.5 liters / 0.26 ft3
Size
Height:
234 mm / 9.21 inches
Diameter:
547 mm / 21.54 inches
Weight:
9.2 kg / 20.28 lbs
Shipping information
Package Height:
605 mm / 23.82 inches
Package Width:
585 mm / 23.03 inches
Package Depth:
605 mm / 23.82 inches
Package Weight:
10 kg / 22.05 lbs
Downloads

RCF products are continually improved. All specifications are therefore subject to change without notice.