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RCF LF21X451 21-Inch 4000 Watt Woofer

RCF LF21X451 21-Inch 4000 Watt Woofer

Original price was: $79.20.Current price is: $43.24.

45 in stock

SKU: J40653445711 Category:

Overview

The RCF LF21X451 is a high-performance 21-inch low-frequency woofer designed for professional audio applications. This powerful transducer features advanced technology, including a 4.5-inch fiberglass inside/outside copper voice coil, ensuring exceptional power handling and durability. With a continuous program power handling of 4000 watts and a sensitivity of 97 dB, the LF21X451 delivers deep, precise bass with minimal distortion, making it ideal for large-scale sound reinforcement systems.

Features:

  • 21-inch low-frequency transducer
  • 4000W continuous program power handling
  • 4.5-inch fiberglass inside/outside copper voice coil
  • 97 dB sensitivity
  • Frequency range: 28 Hz – 1 kHz
  • Dual-forced air ventilation for reduced power compression
  • Dual spider with silicon-based damping control
  • High BL factor of 30.5 Txm for fast and accurate low frequencies
  • Curved cone design with triple roll surround for maximum excursion

Specifications:

  • Nominal Diameter: 21 inches / 533 mm
  • Rated Impedance: 8 ohms
  • Program Power: 4000 watts
  • Power Handling Capacity: 2000 watts
  • Frequency Range: 28 Hz – 1000 Hz
  • Sensitivity: 97 dB
  • Effective Piston Diameter: 470 mm / 18.5 inches
  • Max Excursion Before Damage: 54 mm / 2.13 inches
  • Minimum Impedance: 6.7 ohms
  • Voice Coil Diameter: 115 mm / 4.5 inches
  • Voice Coil Material: Copper
  • Voice Coil Length: 34 mm / 1.34 inches
  • Number of Layers: 2
  • Cone Material: Non-pressed pulp
  • Surround Material: Polycotton
  • Resonance Frequency (Fs): 28 Hz
  • Mechanical Factor (Qms): 6.9
  • Electrical Factor (Qes): 0.39
  • Total Factor (Qts): 0.37
  • BL Factor (Bl): 30.5 T x m
  • Effective Moving Mass (Mms): 355 g
  • Equivalent Cas Air Loaded (Vas): 385 liters
  • Effective Piston Area (Sd): 0.173 m
  • Max Linear Excursion (Xmax): 14 mm
  • Voice Coil Inductance @ 1kHz (Le1k): 2.9 mH
  • Half-Space Efficiency (Eff): 2.2%
  • Overall Diameter: 547 mm / 21.54 inches
  • Bolt Circle Diameter: 527 mm / 20.75 inches
  • Bolt Hole Diameter: 7 mm / 0.28 inches
  • Front Mount Baffle Cut-out: 512 mm / 20.16 inches
  • Volume Occupied by Driver: 6.5 liters / 0.26 ft
  • Weight: 15.5 kg / 34.17 lbs

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