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12_48_18_158_17_15_38_833_4500_front
12_48_18_144_17_15_38_842_4500_back
Alternative/Current Model:
18NTLW5000

Features

  • 115mm (4.5in) Interleaved Sandwich Voice coil (ISV)
  • Weather protected cone and plates
  • Great heat dissipation capability
  • Ultra linear suspension system
  • Neo motor for high power and very efficient thermal
  • exchange
  • Single demodulating ring (SDR) for distortion reduction and maximum SPL
The 18NLW4500 is a 18" (466 mm) extended low frequency loudspeaker, designed for use in vented, bandpass or even horn loaded ì enclosures. The loudspeaker is designed to withstand high power levels without damage while providing clean and undistorted LF reproduction at a very high SPL. For optimum results we recommend amplifiers able to deliver 3600 Watt program power. The 18NLW4500 features a unique motor featuring a high grade Neo magnet assembly in a structure optimized for thermal and magnetic efficiency. 18NLW4500 features include a large displacement suspension system which, in conjunction with a composite reinforced, straight ribbed cone and the Eighteen Sound proprietary SDR technology, allows an undiostorted ultra-linear piston action and provides full mechanical control across the entire working range. The 115mm (4.5 in) state-of-the-art voice-coil utilizing Interleaved Sandwich Voice coil (ISV) technology, provides high levels of thermal stability and durability. The ISV technology achieves a balanced linear motor unit exerting an exceptionally high force factor.

Specifications

Design

Parameters

Mounting and Shipping Info

  • Nominal Impedance4 Ω
  • Minimum Impedance4.2 Ω
  • Nominal Power Handling11800 W
  • Continuous Power Handling23600 W
  • Sensitivity396.5 dB
  • Frequency Range30 - 1000 Hz
  • Voice Coil Diameter115 mm (4.5 in)
  • Winding Materialcopper
  • Winding Depth36.0 mm (1.42 in)
  • Magnetic Gap Depth13.0 mm (0.51 in)
  • Surround ShapeTriple roll
  • Magnet MaterialNeo
  • Woofer Cone TreatmentWeather protected
  • Recommended Enclosure200.0 dm3 (7.06 ft3)
  • Recommended Tuning40 Hz
  • Resonance Frequency37 Hz
  • Re3.3 Ω
  • Qes0.32
  • Qms10.8
  • Qts0.31
  • Vas127.0 dm3 (4.48 ft3)
  • Sd1225.0 cm2 (189.88 in2)
  • η₀2.0 %
  • Xmax14.75 mm
  • Maximum Excursion12.0 mm
  • Mms296.0 g
  • Bl26.7 Txm
  • Le1.59 mH
  • EBP115 Hz
  • Overall Diameter462 mm (18.19 in)
  • Bolt Circle Diameter440 mm (17.32 in)
  • Baffle Cutout Diameter422.0 mm (16.61 in)
  • Depth233 mm (9.17 in)
  • Flange and Gasket Thickness23 mm (0.93 in)
  • Net Weight12.0 kg (26.46 lb)
  • Shipping Weight13.5 kg (29.76 lb)
  • 2 hours test made with continuous pink noise signal within the range Fs-10Fs. Power calculated on rated minimum 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.