- 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.
- 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
