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(1 customer review)
In stock
  • 21″ SubWoofer 4 Ohms
  • Neodymium Magnet
  • 98 dB – 3000 Watts


In stock


SKU: 21SW3000-NDY-4 Categories: , Tag:


The new 21SW3000-NDY-4 is an advanced, high-strength Neodymium subwoofer driver featuring 4.5” inside/outside copper coil with an unique dual forced design ventilation system. This combination deliveries 1500 Watts RMS power handling and a minimum weight of 24 lbs. making this subwoofer an unique product in his category.

The combination of special treated carbon fiber loaded cone assembly, large triple roll surround and a double silicon spider gives the 21SW3000-NDY-4 remarkable strength and excursion control under its large 13.2 mm Xmax. Perfect for high output concert and nightclub applications due to its efficiency that’s been designed to provide powerful and accurate sub-bass frequencies with low distortion and low power compression.


  • Nominal Impedance: 4 Ohms
  • Rated AES Power Handling (RMS): 1500 Watts
  • Program Power: 3000 Watts
  • Sensitivity (1W/1m): 98 dB
  • Voice Coil Diameter: 4.5″

WARNING: Cancer and Reproductive Harm – www.p65warnings.ca.gov

Technical Details


Nominal Diameter 21″ (553 mm)
Nominal impedance 4 Ohms
Rated AES Power Handling (RMS) 1500 Watts
Program Power 3000 Watts
Sensitivity 2.00V at 1m 98 dB
Recommended Hi Pass Crossover**
**For Full Power Handling
45 Hz**
**12db Per Octave Crossover
Frequency Response at -10dB 35 – 1,800 Hz
Voice Coil Diameter 4.5″ (115 mm)
Voice Coil Wire Copper
Voice Coil Winding Depth 34.0 mm
Former Material Glass Fiber
Magnetic Gap Depth 15.0 mm
Frame Material Die Cast Aluminum



Equivalent Volume Vas 337.3 l
Excursion (mathematical)*** Xmax 13.25 mm
Free Air Resonance Fs 31.4 Hz
Mechanical Factor Qms 11.9
Electrical Factor Qes 0.35
Total Factor Qts 0.34
Cone Area Sd 1924 cm²
Mechanical Mass Mms 392 g
Bl Factor Bl 26.65 Tm
Dc Resistance Re 3.2 Ohms
Inductance Le 1.45 mH at 1 kHz
Mechanical Mass Without Air Mmd 345.2 g
Mechanical Compliance Cms 0.065 mm/N

***Xmax=(Voice coil winding depth-Magnetic Gap depth)/2+ Mgnetic Gap Depth/4


Overall Diameter 21.53” (547 mm)
Front Mount Baffle Cutout 20.0” (508 mm)
Mounting Depth 9.21” (234 mm)
Overall Depth 10.0” (255 mm)
Net Weight 24.0 Lbs (10.9 kg)
Shipping Weight 28.6 Lbs (13.0 kg)
Carton Dimensions W x L x H 23.2” x 22.4” x 10.8”
(590 x 570 x 275 mm)


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1 review for 21SW3000-NDY-4

  1. Edgardo Abreu Velez

    Envío Rápido, excelente calidad.

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Repair Parts

Recone Kit for 21SW3000-NDY-4 Loudspeaker