18LW1400 Extended LF Ferrite Transducer KeyFeatures 98 dB SPL 1W / 1m average sensitivity 100 mm (4 in) Interleaved Sandwich Voice coil (ISV) 1000W AES power handling Carbon fiber reinforced straight ribbed cone Double Silicon Spider (DSS) for improved excursion control and linearity Double Demodulating Rings (DDR) for lower distortion Improved heat dissipation via unique basket design and multiple backplate vents Weather protected cone and plates for outdoor usage Ideal for high SPL subwoofer designs Description The 18LW1400 is an extended low frequency loudspeaker which sets an industry standard in 18" (460 mm) high performance transducers. It has been designed for use as a low bass or subwoofer component, in either a reflex, bandpass or horn loaded configuration, in high power auditorium or arena loudspeaker systems. The transducer provides clean, undistorted low frequency reproduction at very high sound pressure levels and is able to withstand high power levels without damage. 18LW1400 design features include a large displacement suspension system which, in conjunction with a carbon fiber reinforced, straight ribbed cone and the Double Silicon Spider (DSS), assure an ultra-linear piston action and provide full control across the entire working range. A 100mm copper voice coil based on Interleaved Sandwich Voice coil (ISV) technology increases this control, providing high levels of thermal stability and durability. ISV technology is based on a high strength fiberglas former with half the coil wound on the outside and half on the inside and bonded together using unique high temperature resin adhesives. Hence, a balanced linear motor unit, exerting an exceptionally high force factor is achieved. The low distortion and unmatched sound quality of the 18LW1400 has been significantly improved by the Double Demodulating Rings (DDR) embedded in the pole piece of the magnetic structure. These have been designed to dramatically reduce the intermodulation and harmonic distortion while improving the transient response. Excellent heat dissipation has been achieved from the special basket design which incorporates air channels between the basket and the magnetic top plate. In addition, 8 air vents incorporated into the back plate are aligned with the voice coil to force air into the lower part of the gap. Maximum flux density in the gap is assured by the top and back plate design, resulting in a high BL factor. 18LW1400 is able to perform properly under inclement weather conditions. The exclusive cone treatment improves pulp strength and gives water repellent properties to both sides of the cone. In addition, the special treatment applied to top and back plates of the magnetic structure is far more resistant to the corrosive effects of salts and oxidization. Models Model 0221883110 0221843110 Code 0221883110 0221843110 Information 8 Ohm 4 Ohm 18LW1400 Extended LF Ferrite Transducer General Specifications Nominal Diameter Rated Impedance AES Power Program Power Peak Power Sensitivity Frequency Range Power Compression @-10dB Power Compression @-3dB Power Compression @Full Power Max Recomm. Frequency Recomm. Enclosure Volume Minimum Impedance Max Peak To Peak Excursion Voice Coil Diameter Voice Coil Winding Material Suspension Cone 460 mm (18 in) 8 Ohm 1000 W 1400 W 7000 W 98 dB 28 - 2500 Hz 0,8 dB 2,1 dB 3,0 dB 150 Hz 130 ÷ 350 lt. (4,59 ÷ 12,36 cuft) 6,4 Ohm at 25°C 50 mm (1,97 in) 100 mm (4 in) copper Triple roll, Polycotton Straight Ribbed, carbon fiber reinforced paper FREQUENCY RESPONSE CURVE OF 18LW1400 MADE ON 180 LIT. ENCLOSURE TUNED 35HZ IN FREE FIELD (4PI) ENVIRONMENT. ENCLOSURE CLOSES THE REAR OF THE DRIVER. THE THIN LINE REPRESENTS 45 DEG. OFF AXIS FREQUENCY RESPONSE. Thiele Small Parameters Fs Re Sd Qms Qes Qts Vas Mms BL Linear Mathematical Xmax Le (1kHz) Ref. Efficiency 1W@1m (half space) 31 Hz 5 Ohm 0,1225 sq. mt. (189,88 sq. in.) 7,2 0,31 0,29 297 lt. (10,49 cuft) 190 gr. (0,42 lb) 24,7 Tm ± 9 mm (± 0,35 in) 2,3 mH 96,5 dB Mounting information Overall diameter N. of mounting holes and bolt Mounting holes diameter Bolt circle diameter Front mount baffle cutout ø Rear mount baffle cutout ø Total depth Flange and gasket thickness Net weight Shipping weight CardBoard Packaging dimensions 462 mm (18,18 in) 8 8,5 mm (0,33 in) 438-440 mm (17,24-17,32 in) 416 mm (16,38 in) 422 mm (16,61 in) 215,4 mm (8,48 in) 26 mm (1,02 in) 13,3 kg (29,36 lb) 14,9 kg (32,9 lb) 482 x 482 x 257 mm (19 x 19 x 10,1 in) FREE AIR IMPEDANCE MAGNITUDE CURVE Notes 1) AES power is determined according to AES2-1984 (r2003) standard 2) Program power rating is measured in 180 lit enclosure tuned 35Hz using a 40 - 400Hz band limited pink noise test signal with 50% duty cycle, applied for 2 hours. 3) The peak power rating represents the maximum permitted instantaneous peak power level over a maximum period of 10ms which will be withstood by the loudspeaker without damage. 4) Sensitivity represents the averaged value of acoustic output as measured on the forward central axis of cone, at distance 1m from the baffle panel, when connected to 2,83V sine wave test signal swept between 100Hz and 500Hz with the test specimen mounted in the same enclosure as given for (1) above. 5) Frequency range is given as the band of frequencies delineated by the lower and upper limits where the output level drops by 10 dB below the rated sensitivity in half space environment. 6) Power compression represents the loss of sensitivity for the specified power, measured from 50-500 Hz, after a 5 min pink noise preconditioning test at the specified power. 7) Linear Math. Xmax is calculated as (Hvc-Hg)/2 + Hg/4 where Hvc is the coil depth and Hg is the gap depth.
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