Description
The RCF LF21N451 is a premium 21-inch woofer engineered for delivering deep, accurate sub-bass with minimal distortion and high efficiency. With a 4.5-inch inside/outside copper voice coil, dual forced-air ventilation, and a carbon fiber-reinforced cone, it ensures superior power handling and thermal stability. Its advanced design offers tight low-frequency response, reduced power compression, and extended excursion, making it ideal for high-performance subwoofer systems.
Product Specifications:
Nominal Diameter: 21" / 533 mm
Rated Impedance: 8 ohm
Program Power: 3000 W
Power Handling: 1500 W AES
Sensitivity: 98.5 dB
Frequency Range: 30 Hz – 1 kHz
Voice Coil & Motor
Voice Coil Diameter: 4.5" / 114 mm
Voice Coil Material: Copper
Voice Coil Design: 2-layer inside/outside
Voice Coil Length: 34 mm
Top Plate Thickness: 15 mm
Magnet Type: Neodymium
BL Factor: 34.5 T·m
Inductance (1 kHz): 3.00 mH
Cone Material: Carbon fiber + nylon + cellulose
Surround: Polycotton, triple roll
Spider: Dual with silicon-based damping
Max Excursion (Before Damage): 58 mm
Xmax (Linear Excursion): 13 mm
Thiele-Small Parameters
Resonance Frequency (Fs): 30 Hz
DC Resistance (Re): 5.60 ohm
Qms: 6.10
Qes: 0.27
Qts: 0.26
Moving Mass (Mms): 315 g
Equivalent Volume (Vas): 375 L
Effective Piston Area (Sd): 0.170 m²
Efficiency (Half-space): 4.00%
Overall Diameter: 547 mm / 21.54"
Baffle Cut-out: 512 mm / 20.16" (front & rear)
Bolt Circle Diameter: 527 mm / 20.75"
Bolt Hole Diameter: 7 mm / 0.28"
Driver Volume Occupied: 6.5 L / 0.26 ft³
Height: 249 mm / 9.8"
Weight: 10.9 kg / 24.03 lbs
Package (H x W x D): 284 x 584 x 604 mm
Shipping Weight: 13.5 kg / 29.76 lbs
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Military & First Responder Discounts
We're proud to support those who serve. Active-duty military, veterans, and first responders qualify for a special discount on your gear. See our Military Discount details here and how to redeem.