Difuzor LF neodim 21NTLW5000

Difuzor LF neodim 21NTLW5000
5639.68 Lei (-19%)
4568.14 Lei
*pretul include TVA
In Stoc
18 Sound
cod produs: 21NTLW5000
Descrierea Produsului

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.


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


Nominal Diameter 533 mm ( in)
Nominal Impedance 8 Ω
Minimum Impedance 6.8 Ω
Nominal Power Handling 1800 W
Continuous Power Handling 4000 W
Sensitivity 97.0 dB
Frequency Range 30 - 1800 Hz
Voice Coil Diameter 115 mm (4.5 in)

Recommended Enclosure 200.0 dm3 (7.06 ft3)
Recommended Tuning 33 Hz

Resonance Frequency 31 Hz
Re 5.3 Ω
Qes 0.38
Qms 5.2
Qts 0.36
Vas 270.0 dm3 (9.53 ft3)
Sd 1662.0 cm2 (257.61 in2)
Xmax 17.5 mm
Mms 372.0 g
Bl 32.0 Txm
Le 1.6 mH
EBP 81 Hz
12 hours test made with continuous pink noise signal within the range Fs-10Fs. Power calculated on rated nominal impedance. Loudspeaker in free air.
2Power on Continuous Program is defined as 3 dB greater than the Nominal rating.
3Applied RMS Voltage is set to 2.83 V for 8 ohms Nominal Impedance.

Overall Diameter 545 mm (21.46 in)
Bolt Circle Diameter 520 mm (20.47 in)
Baffle Cutout Diameter 492.0 mm (19.37 in)
Depth 320 mm (12.6 in)
Flange and Gasket Thickness 18 mm (0.71 in)
Net Weight 12.5 kg (27.56 lb)
Shipping Weight 13.5 kg (29.76 lb)
Shipping Box 570x570x350 mm (22.44x22.44x13.78 in)

  • Model: 21NTLW5000/8
  • Shipping Weight: 13.5Kg
  • 4 Units in Stock
  • Manufactured by: 18Sound
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