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21.0 In

21NTLW5000

21NTLW5000

21.0 In

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Alternative/Current Model:
21NLW9601

Features

  • 96,5 dB SPL 1W / 1m average sensitivity
  • Dual 115mm (4,5 in) Tetracoil Aluminum Voice coil
  • 4000 W program power handling
  • Ultra linear suspension behavior for excellent sound clarity
  • Symmetric flux density and inductance behaviour
  • Low noise forced air cooling design
  • Water repellent cone and epoxy coated plates
  • Suitable for vented, horn loaded and bandpass applications

The 21NTLW5000 is a 21 inch diameter next generation high performance subwoofer, specifically designed for high SPL very low frequency applications in either a reflex, bandpass or horn loaded configuration. For optimum results we recommend the usage of power amplifiers able to deliver 4000W program power without clipping.

The 21NTLW5000 uses Eighteen Sound proprietary Tetracoil technology, where two different, axially separated magnetic gaps and two inside-outside 4.5" diameter aluminum voice coils are wound on the same former and suspended evenly in the two magnetic gaps.

The Tetracoil design key advantages are:
1) a symmetric flux density versus displacement behavior, that minimizes the even distortion products;
2) a very symmetric and flat inductance curve;
3) the equivalent voice coil diameter of a 4.6" Tetracoil speaker is greater than 6". Consequently heat dissipation occurs over a larger surface area, driving AES power handling up to 1800 W.

21NTLW5000 design features include a large displacement suspension system which, in conjunction with a fiberglass reinforced, straight ribbed cone allows an ultra-linear piston action and provides full mechanical control across the entire working range.

In order to furtherly increase power handling and reduce power compression figure, a low density material air diffractor is placed into the backplate venting hole acting as a cooling system, increasing power handling capability and lowering the power compression figure.

21NTLW5000 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 membrane. In addition, magnetic structure metal plates coating is far more resistant than standard zinc coating to the corrosive effects of salts and oxidization.

Specifications

Design

Parameters

Mounting and Shipping Info

  • Nominal Diameter533 mm ( in)
  • Nominal Impedance8 Ω
  • Minimum Impedance6.8 Ω
  • Nominal Power Handling11800 W
  • Continuous Power Handling24000 W
  • Sensitivity397.0 dB
  • Frequency Range30 - 1800 Hz
  • Voice Coil Diameter115 mm (4.5 in)
  • Recommended Enclosure200.0 dm3 (7.06 ft3)
  • Recommended Tuning33 Hz
  • Resonance Frequency31 Hz
  • Re5.3 Ω
  • Qes0.38
  • Qms5.2
  • Qts0.36
  • Vas270.0 dm3 (9.53 ft3)
  • Sd1662.0 cm2 (257.61 in2)
  • Xmax17.5 mm
  • Mms372.0 g
  • Bl32.0 Txm
  • Le1.6 mH
  • EBP81 Hz
  • Overall Diameter545 mm (21.46 in)
  • Bolt Circle Diameter520 mm (20.47 in)
  • Baffle Cutout Diameter492.0 mm (19.37 in)
  • Depth320 mm (12.6 in)
  • Flange and Gasket Thickness18 mm (0.71 in)
  • Net Weight12.5 kg (27.56 lb)
  • Shipping Weight13.5 kg (29.76 lb)
  • Shipping Box570x570x350 mm (22.44x22.44x13.78 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.