RCF LF21N451 Professional Low Frequency 21-Inch Woofer
- 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
The LF21N451 is a very high power handling and efficiency 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 transducer’s high excursion behaviour.
A fully optimised 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.
- Nominal Diameter:21"
- Rated Impedance:8 Ω
- Program Power:3000 W AES
- Power handling capacity:1500 W AES
- Sensitivity:98.5 dB
- Frequency Range:30 Hz ÷ 1000 Hz
- Effective Piston Diameter:18.5"
- Max Excursion Before Damage (peak to peak):2.28"
- Minimum Impedance:7.1 Ω
- Voice Coil Diameter:4.5"
- Voice Coil Material:Copper
- Voice Coil Winding Depth:1.33"
- Number of layers:2
- Kind of layer:inside / outside
- Top Plate Thickness:0.6"
- Cone Material:No pressed pulp carbon fiber reinforced
- Cone Design:Curved
- Surround Material:Polycotton
- Surround Design:Triple roll
- DC resistance:5.6Ω
- Mechanical factor:6
- Electrical factor:0.27
- Total factor:0.26
- BL Factor:34.5 T · m
- Effective Moving Mass:315 g
- 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%
- Overall Diameter:21.5"
- Bolt Circle Diameter:20.7"
- Bolt Hole Diameter:0.25"
- Front Mount Baffle Cut-out:20.1"
- Rear Mount Baffle Cut-out:20.1"
- Volume occupied by the driver:0.229 ft³
- Net Weight:24 lbs
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