RCF LF21N451 Premium Quality 21" Low Frequency Woofer 4.5" Voice Coil 3000W 80ohm 30Hz.-1KHz (11100043) - NEW

General Specifications

• Nominal Diameter: 530 / 21 mm/inch
• Rated Impedance: 8 Ohms
• Program Power: 3000 W AES
• Power handling capacity: 1500 W AES
• Sensitivity: 98.5 dB
• Frequency Range: 30 Hz - 1000 Hz
• Effective Piston Diameter: 470 mm / 18.5 inch
• Max Excursion Before Damage (peak to peak): 58 mm / 2.28 inch
• Minimum Impedance: 7.1 Ohms
• Voice Coil Diameter: 115 mm / 4.5 inch
• Voice Coil Material: Copper
• Voice Coil Winding Depth: 34 mm / 1.33 inch
• Number of layers: 2
• Kind of layer: inside / outside
• Top Plate Thickness: 15 mm / 0.6 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 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%

Mounting information

• Overall Diameter:547 mm / 21.5 inch
• Bolt Circle Diameter: 527 mm / 20.7 inch
• Bolt Hole Diameter: 6.5 mm / 0.25 inch
• Front Mount Baffle Cut-out: 512 mm / 20.1 inch
• Rear Mount Baffle Cut-out: 512 mm / 20.1 inch
• Depth: 250 mm / 9.8 inch
• Volume occupied by the driver: 6.5 litres / 0.229 ft³
• Net Weight: 10.9 kg / 24 lbs