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4-inch, fiberglass inside/outside copper voice coil
3000W continuous program power handling
97.5 dB Sensitivity
25 Hz – 1 kHz Frequency range
Dual Forced Hyperventing System
Dual spider design with silicon based dampening control
Triple-roll surround and corrugated straight cone geometry
Incredibly linear frequency response characteristics, the highest power handling of any comparable 18-inch transducer, the lowest power compression.
Very 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 LF18X401 uses a fibre loaded cone assembly along with a high excursion triple roll surround. This combination provides remarkable strength and a peak to peak maximum excursion of 50 mm. The new dual forced hyper-venting system guarantee a very efficient voice coil ventilation for minimum power compression and incredible power handling.
APPLICATIONS
- The LF18X401 is ideal for use in applications where sizable amounts of low frequency, long excursion and low distortion acoustic power is desired.
- The robust mechanical design and optimised weight of the device make it desirable for use in fixed installation or touring professional loudspeaker 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.
General
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Product type |
Cone driver |
Brand |
RCF |
Reference |
LF18X401 |
Product code |
11100089 |
Informations
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Nominal impedance |
8 ohm |
Dimensional category |
18 inch |
Frequency coverage type |
Sub, Low |
Manufacturer sensitivity |
97 dB |
Calculated sensitivity |
95.62 dB |
Nominal power handling |
1500 W |
Bandwidth |
25÷1000 Hz |
Fundamental parameters
|
Sd |
1200 cm² |
Mms |
215 gr |
Le |
0.83 mH |
Re |
5.4 ohm |
BL |
26.5 T.m |
Small signal parameters
|
Fs |
30 Hz |
Qes |
0.31 |
Qms |
7.4 |
Qts |
0.3 |
Vas |
274 L |
Datas
|
Xmax |
±12 mm |
EBP |
97 Hz |
Zmin |
6 ohm |
Fs / Qts |
100 Hz |
Vas * Qts² |
24.66 L |
Efficiency |
2.3 % |
Calculated efficiency |
2.3 % |
Dimensions
|
Voice coil diameter |
4 inch |
Winding depth |
30 mm |
Gap height |
15 mm |
Outside diameter |
465 mm |
Baffle cutout diameter |
421 mm |
Front thickness |
18 mm |
Depth after front |
188 mm |
Diamètre aimant (mm) |
245 mm |
Shape & Materials
|
Front chape |
Cylindrical |
Magnet type |
Ferrite |
Basket masterial |
Aluminium |
Winding material |
Copper |
Voice coil former |
Glass fiber |
Surround material |
Cloth |
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- 4'' sandwich voice coil fiberglass former
- Double progressive wave Konex spider
- Cloth suround with DAR technology
- Autoclave waterproof cone treatment
- Balanced neodymium magnet circuit
- Cooling radiator and ventilated voice
- coil to reduce power compression
- 98.1 dB sensitivity
Manual/Εγχειρίδιο
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Nominal Diameter 460 mm (18 in)
Overall Diameter 460 mm (18.11 in)
Bolt Circle Diameter 440 mm (17.32 in)
Baffle Cutout Diameter 424 mm (16.7 in)
Depth 202 mm (7.95 in)
Flange and Gasket Thickness 13.9 mm (0.55 in)
Net Weight 4.7 Kg (10.4 lb)
Shipping Box
(Single Carton Box) 536x536x293 mm (21.1x21.1x11.5 in)
Shipping Weight 6 Kg (13.2 lb)
Nominal Impedance 8 Ohm
Minimum Impedance 6 Ohm
Nominal Power Handling *** 600 W
Maximum Power Handling **** 1200 W
Sensitivity (1W/1m) 99 dB
Frequency Range 30÷3150 Hz
Voice Coil Diameter 77 mm (3 in)
Winding Material Cu
Former Material Glass Fiber
Winding Depth 22 mm (0.87 in)
Magnetic Gap Depth 10.5 mm (0.41 in)
Flux Density 1.2 T
Fs 30 Hz
Re 5.1 Ohm
Qes 0.34
Qms 8.68
Qts 0.33
Vas 404.2 dm^3 (14.27 ft^3)
Sd 1166 cm^2 (180.7 in^2)
Xmax * 9.25 mm
Xdamage ** 17.5 mm
Mms 134.3 g
Bl 19.5 N/A
Le 1.35 mH
Mmd 112.6 g
Cms 0.21 mm/N
Rms 2.91 Kg/s
Eta Zero 3.1 %
EBP 88 Hz
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Shape Cylindrical
Product type Cone driver
Brand Sica
Frequency coverage type Sub, Low
Dimensional category 18 inch
Front chape Cylindrical
External diametre 462 mm
Mounting diametre 415 mm
Magnet type Neodymium
Basket masterial Aluminium
Nominal impedance 8 ohm
Nominal power handling 1200 W
Max power handling 2400 W
Manufacturer sensitivity 97.3 dB
Calculated sensitivity 95 dB
Frequency response 35-700 Hz
Voice coil diameter 4 inch
Winding material Copper
Voice coil former Glass fiber
Winding depth 27 mm
Gap height 12 mm
Flux density 1.21 T
Depth 211 mm
Depth after front 196 mm
Front thickness 15 mm
Diamètre aimant (mm) 135 mm
Weight 7.2 kg
Fs 36.2 Hz
Re 5.2 ohm
Qes 0.42
Qms 6.56
Qts 0.39
Vas 189 L
Sd 1164.2 cm²
Cms 98 µm/N
Efficiency 2.07 %
Calculated efficiency 2.05 %
Xmax 8 mm
Xvar 10.1 mm
Mms 197 gr
BL 23.54 T.m
Le 1.35 mH
EBP 86
Dome material Paper
Cone material Paper
Surround material Cloth
Surround shape Double roll
Shipping weight 9 kg
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Nominal Specifications
Nominal Diameter 18“, 460 mm
Overall Diameter 18.11“, 460 mm
Bolt Circle Diameter 17.32“, 440 mm
Baffle Cutout Diameter 16.61“, 422 mm
Depth 7.95“, 202 mm
Flange and Gasket Thickness 0.55“, 13.9 mm
Electrical Specifications
Minimum Impedance 6.6 Ohm
Nominal Impedance 8 Ohm
Nominal Power Handling*** 1,000 W
Maximum Power Handling**** 2,000 W
Sensitivity (1W/1m) 99 dB
Frequency Range 38 - 2500 Hz
Voice Coil Diameter 4“, 100 mm
Winding Material Aluminium
Former Material Glass Fiber
Winding Depth 0.9“, 23 mm
Magnetic Gap Depth 0.47“, 12 mm
Flux Density 1.3 T
THIELE & SMALL Parameters
Resonant Frequency (fs) 38 Hz
DC Resistance (Re) 5.5 Ohm
BL Product (BL) 24.5 N/A
Diaphragm Mass inc. Airload (Mms) 163 grams
Mechanical Compliance of Suspension (Cms) 0.11 mm/N
Rms 4.42 Kg/s
Electromagnetic Q (Qes) 0.35
Mechanical Q (Qms) 8.75
Total Q (Qts) 0.34
Compliance Equivalent Volume (Vas) 7.37 ft³, 208.8 dm³
Surface Area of Cone (Sd) 180.7“², 1,166 cm²
Maximum Linear Excursion (Xmax)* 9.5 mm
Xdamage** 17.5 mm
Coil Inductance (Le) 1.36 mH
Diaphragm mass (Mmd) 141 g
Eta Zero 3.14 %
Notes
*Xmax = [(winding depth - magnetic gap depth) / 2] + (magnetic gap depth / 3)
**Maximum excursion before permanent damage
***2 Hours Test According to AES 2-1984 Rev. 2003
****Maximum power is defined as 3dB greater than nominal power
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