Description
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.
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
Specs
General specifications
NOMINAL DIAMETER:
21 inch / 533 mm
RATED IMPEDANCE:
8 ohm
PROGRAM POWER:
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
MINIMIM IMPEDANCE:
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):
5.00 ohm
MECHANICAL FACTOR:
6.80 Qms
ELECTRICAL FACTOR (QES):
0.40 Qes
TOTAL FACTOR:
0.37 Qts
BL FACTOR (BL):
27.60 T x m
EFFECTIVE MOVING MASS (MMS):
318.0 g
EQUIVALENT CAS AIR LOADED (VAS):
374.0 liters
EFFETTIVE PISTON AREA (SD):
0.120 m2
MAX. LINEAR EXCURSION (XMAX):
11.0 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
Standard compliance
CE MARKING:
Yes
Size
WEIGHT:
8.8 kg / 19.4 lbs
HEIGHT:
234 mm / 9.21 inches
DIAMETER:
547 mm / 21.54 inches
Shipping informations
PACKAGE WIDTH:
585 mm / 23.03 inches
PACKAGE WEIGHT:
10 kg / 22.05 lbs
PACKAGE HEIGHT:
605 mm / 23.82 inches
PACKAGE DEPTH:
605 mm / 23.82 inches
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