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10_35_44_452_smiay3up
10_35_44_450_32onqdpm
Alternative/Current Model:
21LW2500

Features

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

The 21NLW4000 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 3200 Watt program power. 

The 21NLW4000 features a unique motor featuring a high grade neodymium magnet assembly in a structure optimized for thermal and magnetic efficiency. 

The transducer features include a large displacement suspension system which, in conjunction with a composite reinforced, straight ribbed cone, 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 Impedance4 Ω
  • Minimum Impedance3.0 Ω
  • Nominal Power Handling11600 W
  • Continuous Power Handling23200 W
  • Sensitivity394.0 dB
  • Frequency Range30 - 1800 Hz
  • Voice Coil Diameter100 mm (4.0 in)
  • Surround ShapeTriple roll
  • Magnet MaterialNeo
  • Woofer Cone TreatmentWeather protected
  • Recommended Enclosure200.0 dm3 (7.06 ft3)
  • Recommended Tuning30 Hz
  • Resonance Frequency27 Hz
  • Re2.6 Ω
  • Qes0.39
  • Qms16.3
  • Qts0.38
  • Vas380.0 dm3 (13.42 ft3)
  • Sd1660.0 cm2 (257.3 in2)
  • η₀1.9 %
  • Xmax15.0 mm
  • Mms355.0 g
  • Bl20.0 Txm
  • Le1.3 mH
  • EBP69 Hz
  • Overall Diameter545 mm (21.46 in)
  • Bolt Circle Diameter520 mm (20.47 in)
  • Baffle Cutout Diameter492.0 mm (19.37 in)
  • Depth245 mm (9.65 in)
  • Flange and Gasket Thickness18 mm (0.71 in)
  • Net Weight11.6 kg (25.57 lb)
  • Shipping Weight13.1 kg (28.88 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 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.