LF21X451
WOOFER
  • 4,5 - inch fiberglass Inside/Outside copper voice coil
  • 4000 Watt continuous program power handling
  • 97 dB Sensitivity
  • 28 Hz - 1 kHz Frequency range
  • 4,5 - inch fiberglass Inside/Outside copper voice coil
  • 4000 Watt continuous program power handling
  • 97 dB Sensitivity
  • 28 Hz - 1 kHz Frequency range
  • Dual-forced air ventilation for minimum power compression
  • Dual spider designed with silicon based damping control
  • BL of 30.5 Txm to provide a faster and accurate low frequency
The LF21X451 low frequency transducer is the result of many years of R&D developments with the goal of creating new levels of professional audio performance standards. This products features advancements and improvements in all the key areas of transducer technology.
Incredibly linear frequency response characteristics, the highest power handling of any comparable transducer, the lowest power compression. The LF21X451 features a fibre loaded cone assembly along with a high excursion triple roll, constant geometry surround: this combination provides remarkable strength and a peak to peak maximum excursion of 54 mm. The new dual forced hyper-venting system guarantee a very efficient voice coil ventilation for minimum power compression and incredible power handling.

Part Number:

  • 11100092
    LF21X451
Specifications
General specifications
Cone Design:
Curved
Dual-force air ventilation:
Yes
Effective piston diameter:
470 mm / 18.5 inch
Frequency range:
28 - 1000 Hz
Kind of layers:
inside/outside
Magnets:
Ceramic
Max. Excursion Before Damage:
54 mm / 2.13 inch
Minimim Impedance:
6 ohm
Nominal Diameter:
21 inch / 533 mm
Number of layers:
2
Power handling capacity:
2000 W
Program Power:
4000 W
Rated Impedance:
8 ohm
Sensitivity:
97 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:
4.5 inch / 114 mm
Voice Coil Winding Material:
Copper
Voice Coil Length:
34 mm / 1.34 inch
Mounting Information
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
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:
604 mm / 23.78 inches
Package Height:
284 mm / 11.18 inches
Package Weight:
18.5 kg / 40.79 lbs
Package Width:
584 mm / 22.99 inches
Size
Diameter:
547 mm / 21.54 inches
Height:
245 mm / 9.65 inches
Weight:
15.5 kg / 34.17 lbs
Standard compliance
CE marking:
Yes
Thiele - small parameters
BL factor (BL):
30.50 T x m
DC resistance (Re):
5.40 ohm
Effective moving mass (Mms):
355 gr
Effettive piston area (Sd):
0.17 m2
Electrical factor (Qes):
0.39 Qes
Equivalent Cas air loaded (Vas):
385 liters
Half-space efficency (Eff):
2.20%
Max. linear excursion (Xmax):
14 mm
Mechanical factor:
6.90 Qms
Resonance frequency (Fs):
28 Hz
Total factor:
0.37 Qts
Voice coil inductance @ 1kHz (Le1k):
2.90 mH
.