RCF Woofer LF18X451 8 ohm 4000W 18" Driver

Description

The RCF LF18X451 is a high-power 18-inch professional low-frequency woofer designed for premium subwoofer and sound reinforcement systems. Built to handle extreme output levels with accuracy and control, it is well suited for touring applications, large venues, and fixed installations where deep, punchy bass and long-term reliability are essential. The advanced neodymium motor structure and reinforced cone design ensure high efficiency while keeping overall weight manageable.

This woofer has a nominal diameter of 18 inches and an 8 ohm impedance. Power handling is rated at 2000 W AES with a program power capacity of 4000 W, allowing it to operate safely at very high sound pressure levels. Sensitivity is approximately 97 dB (1 W/1 m), delivering strong output with efficient amplifier use. The frequency response extends from roughly 35 Hz to 1 kHz, making it ideal for deep bass reproduction with clean low-mid performance. It features a large 4.5-inch inside/outside copper voice coil for excellent thermal management and consistent performance under heavy load. The rigid aluminum basket and high-excursion suspension system provide mechanical stability and durability. The net weight of the driver is approximately 15.2 kg.

Overall, the RCF LF18X451 is a powerful and reliable choice for professional audio systems that demand maximum low-frequency impact, efficiency, and durability in high-output subwoofer designs.

Nominal diameter: 18 inch / 457 mm
Rated impedance: 8 ohm
Program power: 3600 W
Power handling capacity: 1800 W
Sensitivity: 97.0 dB
Frequency range: 30 – 1000 Hz
Effective piston diameter: 395 mm / 15.55 inch
Maximum excursion before damage: 54 mm / 2.13 inch
Minimum impedance: 6.8 ohm

Voice coil diameter: 4.5 inch / 114 mm
Voice coil winding material: copper
Voice coil length: 34 mm / 1.34 inch
Number of layers: 2
Layer configuration: inside / outside
Top plate thickness: 15 mm / 0.59 inch

Cone design: straight
Surround material: polycotton
Surround design: triple roll
Magnet type: ceramic
Dual-force air ventilation: yes
Spider: 03

Resonance frequency (Fs): 30 Hz
DC resistance (Re): 5.40 ohm
Mechanical factor (Qms): 6.70
Electrical factor (Qes): 0.29
Total factor (Qts): 0.28
Bl factor: 30.50 T·m
Effective moving mass (Mms): 260.0 g
Equivalent compliance volume (Vas): 220.0 liters
Effective piston area (Sd): 0.120 m²
Maximum linear excursion (Xmax): 14 mm
Voice coil inductance at 1 kHz (Le): 1.38 mH
Half-space efficiency: 1.90%

Overall diameter: 465 mm / 18.31 inch
Bolt circle diameter: 442–447 mm / 17.4–17.6 inch
Bolt hole diameter: 7 mm / 0.28 inch
Front mount baffle cut-out: 424 mm / 16.69 inch
Rear mount baffle cut-out: 424 mm / 16.69 inch
Driver displacement volume: 6.5 liters / 0.26 ft³

Compliance standard: CE
Height: 212 mm / 8.35 inch
Diameter: 465 mm / 18.31 inch
Weight: 15.2 kg / 33.51 lbs