RCF LF21X451 21-Inch 4000 Watt Woofer
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 m²
- 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 ft³
- Weight: 15.5 kg / 34.17 lbs
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 m²
- 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 ft³
- Weight: 15.5 kg / 34.17 lbs
Description
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 m²
- 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 ft³
- Weight: 15.5 kg / 34.17 lbs
