RCF LF21N451 High Power Neodymium Subwoofer - 21"

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