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21SW4000-NDY-2 – Special Reinforced

(1 customer review)
In stock
  • 21″ SubWoofer 2 Ohms with Reinforced Cone
  • Neodymium Magnet
  • 97 dB – 4000 Watts


In stock


SKU: 21SW4000-NDY-2 - Reinforced Categories: , Tag:


A special reinforced model for car audio application.
The new 21SW4000-NDY-2 is an advanced, high-strength Neodymium subwoofer driver featuring a 5.3” inside/outside copper coil with an unique dual forced design ventilation system. This combination deliveries 2000 Watts RMS power handling and a minimum weight of 30.2 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 21SW4000-NDY-2 remarkable strength and excursion control under its large 15 mm Xmax, 72 mm peak-to-peak excursion before damage.
Featuring a 2 ohms voice coil and unmatchable low frequency output with a fully optimized T-pole design, this 21” subwoofer creates a whole new category on its class!


  • Nominal Impedance: 2 Ohms
  • Rated AES Power Handling (RMS): 2000 Watts
  • Program Power: 4000 Watts
  • Sensitivity (1W/1m): 97 dB
  • Voice Coil Diameter: 5.3″

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

Technical Details


Nominal Diameter 21″ (553 mm)
Nominal impedance 2 Ohms
Rated AES Power Handling (RMS) 2000 Watts
Program Power 4000 Watts
Sensitivity 1.41V at 1m 97 dB
Recommended Hi Pass Crossover**
**For Full Power Handling
45 Hz**
**12db Per Octave Crossover
Frequency Response at -10dB 35 – 1,200 Hz
Voice Coil Diameter 5.3″ (135 mm)
Voice Coil Wire Copper
Voice Coil Winding Depth 39.0 mm
Former Material Glass Fiber
Magnetic Gap Depth 18.0 mm
Frame Material Die Cast Aluminum



Equivalent Volume Vas 284.7 l
Excursion (mathematical)*** Xmax 15.00 mm
Free Air Resonance Fs 30.8 Hz
Mechanical Factor Qms 12.33
Electrical Factor Qes 0.28
Total Factor Qts 0.28
Cone Area Sd 1924 cm²
Mechanical Mass Mms 485.0 g
Bl Factor Bl 24.36 Tm
Dc Resistance Re 1.8 Ohms
Inductance Le 1.14 mH at 1 kHz
Mechanical Mass Without Air Mmd 437.2 g
Mechanical Compliance Cms 0.055 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 9.64” (245 mm)
Overall Depth 10.23” (265 mm)
Net Weight 30.2 Lbs (13.7 kg)
Shipping Weight 35.3 Lbs (16.0 kg)
Carton Dimensions W x L x H 23.2” x 22.4” x 10.8”
(590 x 570 x 275 mm)


Customer questions & answers

  1. 0 votes
    Q Is there a recone kit? answer now
    Asked by David Zaiter on August 9, 2019 8:49 pm
    Answered by the admin Yes, here is a link to purchase the reinforced recone kit: https://prvaudio.com/products/rk21sw4000-ndy-2-reinforced/

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1 review for 21SW4000-NDY-2 – Special Reinforced

  1. Yeikous arrocha


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Repair Parts

Reinforced Replacement Diaphragm for 21SW4000-NDY-2