RCF LF 18 P 400

Incredibly linear frequency response characteristics, extreme high power handling while generating the lowest harmonic distortion of any comparable 18-inch trasducer wtihin its application range. The L18P400 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 reachees its maximum excursion limits.Forced air venting system.

More Information

4-inch, fiberglass inside/outside copper voice coil
2000W continuous program power handling
97.5 dB Sensitivity
25 Hz – 1 kHz Frequency range
Aluminum demodulation ring
Forced air ventilation and 15mm top plate for minimum power compression
Dual spider design with silicon based dampening control
Triple roll surround and corrugated straight cone geometry

Technical Specification

General Specifications

Nominal Diameter: 460 mm / 18 inch
Rated Impedance: 8 O
Program Power: 2000 W AES
Power handling capacity: 1000 W AES
Sensitivity: 97.5 dB
Frequency Range: 25 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: 6.5 O
Voice Coil Diameter: 100 mm / 4 inch
Voice Coil Material: Copper
Voice Coil Winding Depth: 25 mm / 1.0 inch
Number of layers: 2
Kind of layer: inside / outside
Top Plate Thickness: 15 mm / 0.6 inch
Cone Material: No pressed pulp
Cone Design: Straight
Surround Material: Polycotton
Surround Design: Triple roll

Thiele/Small Parameters

Resonance frequency: 29 Hz
DC resistance: 5.1 O
Mechanical factor: 7.6
Electrical factor: 0.29
Total factor: 0.28
BL Factor: 24.6 T · m
Effective Moving Mass: 200 g
Equivalent Cas air load: 340 liters
Effettive piston area: 0.122 m²
Max. linear excursion (mathematical): 8.8 mm
Voice - coil inductance @ 1kHz: 2.5 mH
Half-space efficiency: 2.63%

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 / 0.25 inch
Front Mount Baffle Cut-out: 424 mm / 16.7 inch
Rear Mount Baffle Cut-out: 424 mm / 16.7 inch
Depth: 205 / 8.1 inch
Volume occupied by the driver: 6.0 litres / 0.21 ft³
Net Weight: 13.3 kgs / 29.3 lbs

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