SPEAKER 18SOUND 18" 18NTLW5000-4OHMS

The 18NTLW5000 is a 18 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 18NTLW5000 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.
18NTLW5000 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.
18NTLW5000 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.

• The 18NTLW5000 is a 18 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 18NTLW5000 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.

• 18NTLW5000 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.

• 18NTLW5000 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.

Features

• 95 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

Specifications

• Nominal Impedance 8 Ω
  
• Minimum Impedance Ω
  
• Nominal Power Handling1800 W
  
• Continuous Power Handling4000 W
  
• Sensitivity95.0 dB
  
• Frequency Range 30 - 1800 Hz
  
• Voice Coil Diameter 115 mm (4.5 in)
  
• Winding Material aluminum

Design

• Surround Shape Triple roll
  
• Cone Shape Curvilinear
  
• Magnet Material Neo
  
• Woofer Cone Treatment Water,UV repellent
  
• Recommended Enclosure 180.0 dm3 (6.36 ft3)
  
• Recommended Tuning 35 Hz

Parameters

• Resonance Frequency 32 Hz
  
• Re  Ω
  
• Qes 0.33
  
• Qms 8.52
  
• Qts 0.32
  
• Vas 176.0 dm3 (6.22 ft3)
  
• Sd 1156.0 cm2 (179.18 in2)
  
• Xmax 17.5 mm
  
• Mms 295.0 g
  
• Bl 31.3 Txm
  
• Le 1.85 mH
  
• EBP 96 Hz

Mounting and Shipping Info

• Overall Diameter 462 mm (18.19 in)
  
• Bolt Circle Diameter 440 mm (17.32 in)
  
• Baffle Cutout Diameter 416.0 mm (16.38 in)
  
• Depth 310 mm (12.2 in)
  
• Flange and Gasket Thickness 26 mm (1.02 in)
  
• Net Weight 12.0 kg (26.46 lb)
  
• Shipping Weight 12.8 kg (28.22 lb)