Transducer design features include a large displacement suspension system which, in conjunction with a fiberglass reinforced, straight ribbed cone and the Eighteen Sound proprietary Double Silicon Spider (DSS) technology, allows an ultra-linear piston action and provides full mechanical control across the entire working range.
The 100 mm (4 in) inside-outside copper voice coil based on Interleaved Sandwich Voice coil (ISV) technology provides high levels of thermal stability and durability.
In order to furtherly increase power handling and reduce power compression figure, 18LW2400 uses the same voice coil ventilation technology developed for our flagship 9000 neodymium transducer series. A special low density material air diffractor has been placed into the backplate acting as a cooling system, increasing power handling capability and lowering the power compression figure. As a final result Eighteen Sound engineers obtained almost 1 dB reduction in full power power compression value if compared to 18LW1400, and an increased program power handling value of 2400 Watt.
The low distortion and unmatched sound quality of the 18LW2400 has been significantly improved by Double Demodulating Rings (DDR) embedded in the pole piece of the magnetic structure. These
have been designed to reduce the intermodulation and harmonic distortion while improving the transient response.
10% reduction in weight have been obtained optimizing the magnetic structure through advanced FEA CAD simulation tools. 18LW2400 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)
• 2400 W program power handling
• Fiberglass reinforced cone
• Double Silicon Spider (DSS) for superior excursion control and linearity
• Double Demodulating Rings (DDR) for lower distortion
• Improved heat dissipation via multi-cell air diffractor 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:1200 W
• Program Power:2400 W
• Peak Power:7000 W
• Sensitivity:98 dB
• Frequency Range:31 - 2500 Hz
• Power Compression @-10dB:0,7 dB
• Power Compression @-3dB:1,5 dB
• Power Compression @Full Power:2,2 dB
• Max Recomm. Frequency:500 Hz
• Recomm. Enclosure Volume:130 ÷ 350 lt. (4,59 ÷ 12,36 cuft)
• Minimum Impedance:6,3 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, fiberglass reinforced cellulose

THIELE SMALL PARAMETERS

• Fs:35 Hz
• Re:5 Ohm
• Sd:0,1225 sq. mt. (189,88 sq. in.)
• Qms:7,2
• Qes:0,32
• Qts:0,31
• Vas:230 lt. (8.12 cuft)
• Mms:192 gr. (0,42 lb)
• BL:25,6 Tm
• Linear Mathematical Xmax:± 9,5 mm (± 0,38 in)
• Le (1kHz):1,35 mH
• Ref. Efficiency 1W@1m (half space):96,7 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:214,4 mm (8,44 in)
• Flange and gasket thickness:24.5 mm (0.96 in)
• Net weight:11,9 kg (26,18 lb)
• Shipping weight:13,5 kg (29,7 lb)
• CardBoard Packaging dimensions:482 x 482 x 257 mm (19 x 19 x 10,1 in)