RCF LF21N451
High Power / High Output Subwoofer
Replacement 21" Neodymium Low Frequency Transducer (Woofer)
The LF21N451 is a very high power handling and efficient 21" transducer specially designed to provide powerful and accurate sub-bass frequencies with low distortion and low power compression.
The height of the voice coil has been specifically designed to improve the excursion and linearity at very low frequencies.
The LF21N451 uses a special RCF developed carbon fibre + nylon + cellulose composite pulp which reinforces and improves the rigidity of the cone structure.
The new pulp and the large triple roll surround along double silicon spider system ensure excellent control and makes the cone resistant to deformation caused by very large displacements and pressure created by the transducers high excursion behavior.
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.
Applications
The LF21N451 is ideal in applications where light weight,very high BL and power handling are required.
It's especially used for tourimg,perfect for powerful lows in horn loaded sub bass system or reflex designs.
Features
4.5 - inch Inside/Outside copper voice coil
3000 Watt continuous program power handling
98.5 dB Sensitivity
30 Hz - 1 kHz Frequency range
Dual-forced air ventilation for minimum power compression
Dual spider designed with silicon based damping control
BL of 34.5 Txm to provide a faster and accurate low frequency
General Specifications
Nominal Diameter: 530 / 21 mm/inch
Rated Impedance: 8 ohms
Program Power: 3000 Watts AES
Power handling capacity: 1500 Watts AES
Sensitivity: 98.5 dB
Frequency Range: 30 Hz - 1000 Hz
Effective Piston Diameter: 470 / 18.5 mm/inch
Max Excursion Before Damage (peak to peak): 58 / 2.28 mm/inch
Minimum Impedance: 7.1 ohms
Voice Coil Diameter: 115 / 4.5 mm/inch
Voice Coil Material: Copper
Voice Coil Winding Depth: 34 / 1.33 mm/inch
Number of layers: 2
Kind of layer: inside / outside
Top Plate Thickness: 15 / 0.6 mm/inch
Cone Material: No pressed pulp carbon fiber reinforced
Cone Design: Curved
Surround Material: Polycotton
Surround Design: Triple roll
Thiele Small Parameters
DC resistance: 5.6 ohms
Mechanical factor: 6
Electrical factor: 0.27
Total factor: 0.26
BL Factor: 34.5 T . m
Effective Moving Mass: 315 gr
Equivalent Cas air load: 375 liters
Effettive piston area: 0.173 m2
Max. linear excursion (mathematical): 13.2 mm
Voice - coil inductance @ 1KHz: 3.0 mH
Half-space efficiency: 4.0 %
Mounting Information
Overall Diameter: 547 / 21.5 mm/inch
Bolt Circle Diameter: 527 / 20.7 mm/inch
Bolt Hole Diameter: 6.5 / 0.25 mm/inch
Front Mount Baffle Cut-out: 512 / 20.1 mm/inch
Rear Mount Baffle Cut-out: 512 / 20.1 mm/inch
Depth: 250 / 9.8
Volume occupied by the driver: 6.5 / 0.229 liters/ft3
Net Weight 10.9 / 24 Kg/Lbs
Shipping Weight: 12.1 / 26.6 Kg/Lbs
Inventory Status: Available
