RCF LF21X451 21" Woofer, 2000 W RMS, 4000 Watts program, 4.5" coil

RCF LF21X451 21" Woofer, 2000 W RMS, 4000 Watts program, 4.5" coil

RCF

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RCF LF21X451 T.C.
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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

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 PARAMETERS

    • 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
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