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Jntl3auz
Alternative/Current Model:
21NLW4000

Features

  • 95 dB SPL 1W / 1m average sensitivity
  • 100 mm (4 in) Interleaved Sandwich Voice coil (ISV)
  • 3200W program power handling
  • 70 mm (2,76 in) peak to peak excursion
  • Ultra linear dual magnet motor design
  • Single Demodulating Ring (SDR) for lower distortion
  • Composite reinforced straight ribbed cone
  • Optimized high grade ferrite magnet assembly
  • Recommended for subwoofer usage in compact vented enclosures

The 21LW2500 is a 21" (533 mm) extended low frequency loudspeaker, designed for use in vented 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 21LW2500 features a unique motor featuring a high grade ferrit magnet assembly in a structure optimized for thermal and magnetic efficiency. 21LW2500 features include a large displacement suspension system which, in conjunction with a composite 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 100mm (4 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 Diameter533 mm ( in)
  • Nominal Impedance8 Ω
  • Minimum Impedance6.1 Ω
  • Nominal Power Handling11600 W
  • Continuous Power Handling23200 W
  • Sensitivity395.0 dB
  • Frequency Range30 - 1000 Hz
  • Voice Coil Diameter100 mm (4.0 in)
  • Winding Materialcopper
  • Surround ShapeTriple roll
  • Cone ShapeCurvilinear
  • Magnet MaterialFerrite
  • Woofer Cone TreatmentWater,UV repellent
  • Recommended Enclosure300.0 dm3 (10.59 ft3)
  • Recommended Tuning32 Hz
  • Resonance Frequency29 Hz
  • Re4.9 Ω
  • Qes0.38
  • Qms22.0
  • Qts0.37
  • Vas305.0 dm3 (10.77 ft3)
  • Sd1660.0 cm2 (257.3 in2)
  • Xmax14.0 mm
  • Mms380.0 g
  • Bl30.0 Txm
  • Le2.58 mH
  • EBP76 Hz
  • Overall Diameter545 mm (21.46 in)
  • Bolt Circle Diameter520 mm (20.47 in)
  • Baffle Cutout Diameter492.0 mm (19.37 in)
  • Depth252 mm (9.92 in)
  • Flange and Gasket Thickness18 mm (0.71 in)
  • Net Weight17.9 kg (39.46 lb)
  • Shipping Weight19.4 kg (42.77 lb)
  • Shipping Box570x570x290 mm (22.44x22.44x11.42 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.