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18lw2400_01
Bbpdopwu
Alternative/Current Model:
18LW1400

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
The 18LW2400 is an 18 inch extended low frequency loudspeaker designed for high SPL subwoofer applications in either a reflex, bandpass or horn loaded configuration. Compared to our industry standard 18LW1400, the 18LW2400 provides higher maximum SPL, increased program power handling and lower power compression. For optimum results we recommend amplifiers able to deliver 2400 Watt program power without clipping. 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.

Specifications

Design

Parameters

Mounting and Shipping Info

  • Nominal Diameter460 mm ( in)
  • Nominal Impedance8 Ω
  • Minimum Impedance6.3 Ω
  • Nominal Power Handling11200 W
  • Continuous Power Handling22400 W
  • Sensitivity398.0 dB
  • Frequency Range31 - 2500 Hz
  • Voice Coil Diameter100 mm (4.0 in)
  • Winding Materialcopper
  • Surround ShapeTriple roll
  • Cone ShapeStraight
  • Magnet MaterialFerrite
  • Woofer Cone TreatmentWeather protected
  • Recommended Enclosure220.0 dm3 (7.77 ft3)
  • Recommended Tuning37 Hz
  • Resonance Frequency35 Hz
  • Re5.0 Ω
  • Qes0.32
  • Qms7.2
  • Qts0.31
  • Vas230.0 dm3 ( ft3)
  • Sd0.12 cm2 ( in2)
  • Xmax9.5 mm
  • Mms192.0 g
  • Bl25.6 Txm
  • Le1.35 mH
  • EBP109 Hz
  • Overall Diameter462 mm (18.19 in)
  • Bolt Circle Diameter438 mm (17.24 in)
  • Baffle Cutout Diameter416.0 mm (16.38 in)
  • Depth214 mm (8.43 in)
  • Flange and Gasket Thickness24 mm (0.94 in)
  • Net Weight11.9 kg (26.24 lb)
  • Shipping Weight13.8 kg (30.42 lb)
  • Shipping Box482 x 482 x 257 mm (18.98x18.98x10.12 in)
  • 2 hours test made with continuous pink noise signal within the range Fs-10Fs. Power calculated on rated nominal impedance. Loudspeaker in free air.
  • Power on Continuous Program is defined as 3 dB greater than the Nominal rating.
  • Applied RMS Voltage is set to 2.83 V for 8 ohms Nominal Impedance.