RCF LF 18 G 401

The LF18G401 is a 18-inch woofer with linear frequency response cheracteristics and very high power handling. The LF18G401 uses a fibre loaded cone assembly along with a high excursion triple roll, constant geometry surround. This combination provides remarkable strength and peak to peak maximum excursion of 50mm.

More Information

4-inch, fiberglass inside/outside copper voice coil
1800W continuous program power handling
98 dB Sensitivity
30 Hz – 1 kHz Frequency range
Dual spider design with silicon based dampening control
Triple-roll surround and corrugated straight cone geometry

Technical Specification

General Specifications

Nominal Diameter: 460 / 18 inch
Rated Impedance: 8 O
Program Power: 1800 W AES
Power handling capacity: 900 W AES
Sensitivity: 98 dB
Frequency Range: 30 Hz - 1000 Hz
Effective Piston Diameter: 395 mm / 15.6 inch
Max Excursion Before Damage (peak to peak): 50 mm / 2.0 inch
Minimum Impedance: 5.9 O
Voice Coil Diameter: 100 mm / 4 inch
Voice Coil Material: Copper
Voice Coil Winding Depth: 23 mm / 0.9 inch
Number of layers: 2
Kind of layer: inside / outside
Top Plate Thickness: 12 mm / 0.5 inch
Cone Material: No pressed pulp
Cone Design: Straight
Surround Material: Polycotton
Surround Design: Triple roll

Thiele/Small Parameters

Fs: 33Hz
DC resistance: 4.8O
Mechanical factor: 7.6
Electrical factor: 0.30
Total factor: 0.29
BL Factor: 24.6 T · m
Effective Moving Mass: 182 g
Equivalent Cas air load: 268 litres
Effettive piston area: 0.122 m²
Max. linear excursion (mathematical): 8.5 mm
Voice - coil inductance @ 1kHz: 2.4 mH
Half-space efficiency: 3.09%

Mounting information

Overall Diameter: 465 mm / 18.3 inch
Bolt Circle Diameter: 442-447 mm / 17.4-17.6 inch
Bolt Hole Diameter: 6.5 mm / 0.3 inch
Front Mount Baffle Cut-out: 424 mm / 16.7 inch
Rear Mount Baffle Cut-out: 424 mm / 16.7 inch
Depth: 205 mm / 8.1 inch
Volume occupied by the driver: 7.0 litres / 0.25 ft³
Net Weight: 13 / 28.9 kg/lbs

View full details