RCF - LF18G401

The LF18G401 is a 18-inch woofer with linear frequency response characteristics 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 a peak to peak maximum excursion of 50 mm.

Applications
The LF18G401 is ideal for use in applications whereincredible power handling, long excursion and perfect control is required. Ideal for high quality professional bass reflex and bass-horn systems. The robust mechanical design and optimised weight of the device make it desirable for use in fixed installation or portable professional loudspeaker systems.

4-inch Inside/outside copper voice coil
1800 Watt 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

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

THIELE – SMALL PARAMETERS
Resonance frequency Fs 33 Hz
DC resistance Re 4.8 Ohm
Mechanical factor Qms 7.6
Electrical factor Qes 0.30
Total factor Qts 0.29
BL factor BL 24.6 T – m
Effective Moving Mass Mms 182 gr
Equivalent Cas air load Vas 268 liters
Effective piston area Sd 0.122 m2
Max. linear excursion (mathematical) Xmax 8.5 mm
Voice – coil inductance @ 1kHz Le1k 2.4 mH
Half-space efficiency Eff 3.09 %

MOUNTING INFORMATION
Overall Diameter 465/18.3 mm/inch
Bolt Circle Diameter 442-447 mm
Bolt Hole Diameter 6.5/0.3 mm/inch
Front Mount Baffle Cut-out 424/16.7 mm/inch
Rear Mount Baffle Cut-out 424/16.7 mm/inch
Depth 205/8.1 mm/inch
Volume occupied by the driver 7.0 liters/ft3

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