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 sub-woofer 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.

Features

• 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

Specifications

GENERAL SPECIFICATIONS

• Nominal Diameter:460 mm (18 in)
• Rated Impedance:8 Ohm
• AES Power:1000 W
• Program Power:1400 W
• Peak Power:7000 W
• Sensitivity:98 dB
• Frequency Range:28 - 2500 Hz
• Power Compression @-10dB:0,8 dB
• Power Compression @-3dB:2,1 dB
• Power Compression @Full Power:3,0 dB
• Max Recomm. Frequency:500 Hz
• Recomm. Enclosure Volume:130 ÷ 350 lt. (4,59 ÷ 12,36 cuft)
• Minimum Impedance:6,4 Ohm at 25°C
• Max Peak To Peak Excursion:50 mm (1,97 in)
• Voice Coil Diameter:100 mm (4 in)
• Voice Coil Winding Material:copper
• Suspension:Triple roll, Polycotton
• Cone:Straight Ribbed, carbon fiber reinforced paper

THIELE SMALL PARAMETERS

• Fs:31 Hz
• Re:5 Ohm
• Sd:0,1225 sq. mt. (189,88 sq. in.)
• Qms:7,2
• Qes:0,31
• Qts:0,29
• Vas:297 lt. (10,49 cuft)
• Mms:190 gr. (0,42 lb)
• BL:24,7 Tm
• Linear Mathematical Xmax:± 9 mm (± 0,35 in)
• Le (1kHz):2,3 mH
• Ref. Efficiency 1W@1m (half space):96,5 dB

MOUNTING INFORMATIONS

• Overall diameter:462 mm (18,18 in)
• N. of mounting holes:8
• Mounting holes diameter:8,5 mm (0,33 in)
• Bolt circle diameter:438-440 mm (17,24-17,32 in)
• Front mount baffle cutout ø:416 mm (16,38 in)
• Rear mount baffle cutout ø:422 mm (16,61 in)
• Total depth:215,4 mm (8,48 in)
• Flange and gasket thickness:26 mm (1,02 in)
• Net weight:13,3 kg (29,36 lb)
• Shipping weight:14,9 kg (32,9 lb)
• CardBoard Packaging dimensions:482 x 482 x 257 mm (19 x 19 x 10,1 in)