RCF LF21X451 WOOFER

FEATURES  

4,5 - inch fiberglass Inside/Outside copper voice coil

           

4000 Watt continuous program power handling

           

97 dB Sensitivity

           

28 Hz - 1 kHz Frequency range

           

Dual-forced air ventilation for minimum power compression

           

Dual spider designed with silicon based damping control

           

BL of 30.5 Txm to provide a faster and accurate low frequency

GENERAL SPECIFICATIONS

Nominal Diameter: 530 / 21 mm/inch

           

Rated Impedance: 8 Ohm

           

Program Power: 4000 W AES

           

Power handling capacity: 2000 W AES

           

Sensitivity: 97 dB

           

Frequency Range: 28 Hz ÷ 1000 Hz

           

Effective Piston Diameter: 470 / 18.5 mm/inch

           

Max Excursion Before Damage (peak to peak): 54 / 2.12 mm/inch

           

Minimum Impedance: 6.7 Ohm

           

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

           

Cone Design: Curved

           

Surround Material: Polycotton

           

Surround Design: Triple roll

       

THIELE/SMALL PARAMETES

Resonance frequency: 28 Hz

           

DC resistance: 5.4?

           

Mechanical factor: 6.9

           

Electrical factor: 0.39

           

Total factor: 0.37

           

BL Factor: 30.5 T · m

           

Effective Moving Mass: 355 g

           

Equivalent Cas air load: 385 liters

           

Effettive piston area: 0.173 m²

           

Max. linear excursion (mathematical): 13.5 mm

           

Voice - coil inductance @ 1kHz: 2.9 mH

           

Half-space efficiency: 2.2%   

         

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: 230 / 9.05 mm/inch

           

Volume occupied by the driver: 6.5 / 0.229 liters/ft³

           

Net Weight: 15.5 / 34.0 kg/lbs

SHIPPING INFORMATION           

Shipping weight: 17.59 / 26.6 kg/lbs