RCF LF21N451 21-inch Neo Woofer 1500 Watts Rms 3000 Watts Peak PRO LF Transducer Dual Forced Air Vent 4.5" Inside | Outside Copper Voice Coil 8-Ohm

Description

• 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 || Size || Height : 249 mm / 9.8 inches || Diameter : 547 mm / 21.54 inches || Weight : 10.9 kg / 24.03 lbs ||
• SPECIFICATIONS || Nominal Diameter : 21 inch / 533 mm || Rated Impedance : 8 ohm || Program Power (watt) : 3000 W || Power handling capacity : 1500 W || Sensitivity : 98.5 dB || Frequency range : 30 - 1000 Hz || Effective piston diameter : 470 mm / 18.5 inch || Max. Excursion Before Damage : 58 mm / 2.28 inch || Minimum Impedance (ohm) : 7.1 ohm ||
• SPECIFICATIONS || Voice Coil Diameter : 4.5 inch / 114 mm || Voice Coil Winding Material : Copper || Voice Coil Length : 34 mm / 1.34 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 : 3 || Safety agency : CE compliant ||
• PARAMETERS || Resonance frequency (Fs) : 30 Hz || DC resistance (Re) (ohm) : 5.60 ohm || Mechanical factor : 6.10 Qms || Electrical factor : 0.27 Qes || Total factor : 0.26 Qts || Bl factor (Bl) (T x m) : 34.50 T x m || Effective moving mass (Mms) : 315.0 g || Equivalent Cas air loaded (Vas) : 375.0 liters || Effective piston area (Sd) : 0.170 m2 || Max. linear excursion (Xmax) : 13 mm || Voice coil inductance @ 1kHz (Le1k) : 3.00 mH || Half-space efficency (Eff) : 4.00%||
• MOUNTING INFORMATION || Overall diameter : 547 mm / 21.54 inches || 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 || Rear mount baffle cut-out : 512 mm / 20.16 inch || Volume occupied by the driver : 6.5 liters / 0.26 ft3 || SHIPPING INFORMATION || Height : 284 mm / 11.18 inches || Width : 584 mm / 22.99 inches || Depth : 604 mm / 23.78 inches || Weight : 13.5 kg / 29.76 lbs ||

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 fiber + 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 behaviour. 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 || 4,5 - 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 || SPECIFICATIONS || Nominal Diameter : 21 inch || Rated Impedance : 8 ohm || Program Power (watt) : 3000 W || Power handling capacity : 1500 W || Sensitivity : 98.5 dB || Frequency range : 30 - 1000 Hz || Effective piston diameter : 18.5 inch || Max. Excursion Before Damage : 2.28 inch || Minimum Impedance (ohm) : 7.1 ohm || SPECIFICATIONS || Voice Coil Diameter : 114 mm || Voice Coil Winding Material : Copper || Voice Coil Length : 1.34 inch || Number of layers : 2 || Kind of layers : inside/outside || Top Plate Thickness : 0.59 inch || Cone Design : Curved || Surround Material : Polycotton || Surround Design : Triple roll || Magnets : Neodymium || Dual-force air ventilation : Yes || Spider : 3 || THIELE - SMALL PARAMETERS || Resonance frequency (Fs) : 30 Hz || DC resistance (Re) (ohm) : 5.60 ohm || Mechanical factor : 6.10 Qms || Electrical factor : 0.27 Qes || Total factor : 0.26 Qts || Bl factor (Bl) (T x m) : 34.50 T x m || Effective moving mass (Mms) : 315.0 g || Equivalent Cas air loaded (Vas) : 375.0 liters || Effective piston area (Sd) : 0.170 m2 || Max. linear excursion (Xmax) : 13 mm || Voice coil inductance @ 1kHz (Le1k) : 3.00 mH || Half-space efficiency (Eff) : 4.00%|| MOUNTING INFORMATION || Overall diameter : 21.54 inches || Bolt circle diameter : 20.75 inch || Bolt hole diameter : 0.28 inch || Front mount baffle cut-out : 20.16 inch || Rear mount baffle cut-out : 20.16 inch || Volume occupied by the driver : 0.26 ft || Size || Height : 9.8 inches || Diameter : 21.54 inches || Weight : 24.03 lbs || SHIPPING INFORMATION || Height : 11.18 inches || Width : 22.99 inches || Depth : 23.78 inches || Weight : 29.76 lbs ||

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