RCF - Woofer/LF18X400

Incredibly linear frequency response characteristics, extreme high power handling while generating the lowest harmonic distortion of any comparable 18-inch transducer within its application range. The LF18X400 uses a fibre loaded cone assembly along with a high excursion triple roll, constant geometry surround. A fully optimised T-pole design generate the minimum amount of flux modulation. The T-pole also features RCF Precision’s spaced gap demodulation technology, progressively braking the voice coil, providing a much smoother transition for the moving mass as it reaches its maximum excursion limits. Forced air venting system.

Applications
The LF18X400 is ideal for use in applications where incredible power handling, long excursion and perfect control is required. Ideal for high quality professional bass reflex and bass-horn systems. The transducer’s low frequency extension, coupled with its extremely low generation of harmonic distortion, also makes it ideal for use within critical listening applications such as studio monitoring subwoofer systems.

4-inch Inside/outside copper voice coil
2000 Watt continuous program power handling
97.5 dB Sensitivity
25 Hz – 1 kHz Frequency range
Progressive, spaced, aluminum demodulation rings
Forced air ventilation and 14 mm top plate for minimum power compression
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 2000 Watts
Power handling capacity 1000 Watts
Sensitivity 97.5 dB
Frequency Range 25-1000 Hz
Effective Piston Diameter 395/15.6 mm/inch
Maximum Excursion Before Damage (peak to peak) 50/2,0 mm/inch
Minimum Impedance 6.0 Ohm
Voice Coil Diameter 100/4 mm/inch
Voice Coil Material Copper
Voice Coil Winding Depth 25/1.0 mm/inch
Number of layers 2
Kind of layer Inside/Outside
Top Plate Thickness 14/0.55 mm/inch
Cone Material No pressed pulp
Cone Design Straight
Surround Material Polycotton
Surround Design Triple roll

THIELE – SMALL PARAMETERS
Resonance frequency Fs 28 Hz
DC resistance Re 5.1 Ohm
Mechanical factor Qms 4.6
Electrical factor Qes 0.29
Total factor Qts 0.27
BL factor BL 24.2 T – m
Effective Moving Mass Mms 190 gr
Equivalent Cas air load Vas 360 liters
Effective piston area Sd 0.122 m2
Max. linear excursion (mathematical) Xmax 9.0 mm
Voice – coil inductance @ 1kHz Le1k 2.3 mH
Half-space efficiency Eff 2.63 %

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 210/8.3 mm/inch
Volume occupied by the driver 7.0 liters/ft3

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