Our most technologically advanced, high-performance subwoofer now has the flexibility to meet any amplifier and enclosure combination. Its unique bifilar, low-inductance, inside/outside wound, dual 2Ω voice coil features heavy gauge pure copper windings and a reinforced high-temperature fiberglass former. Mirror-image spiders spaced 13 mm apart provide effortless coil control and dynamic balance at maximum excursion.

Designed using advanced measurement and FEA optimization tools, the NSW6021-124 enables easy switching between 1, 2, or 4-ohm amplifier loads while ensuring near zero-inductance transient response. One woofer for all your designs whether vented, horn-loaded, or sealed. Any amplifier, any cabinet, allow us to surpass your expectations.

FEATURES INCLUDE:

Bifilar, Low Inductance Voice Coil
Selectable 1, 2+2, or 4Ω
21” Nominal Diameter
5000 W Program Power
Spaced Dual Spiders
24mm Xvar

Applications

Subwoofer | Pro Audio

Box Type: Vented, Sealed, Scoop Loading, Horn Loading

Specifications

SPECIFICATION
Nominal Basket Diameter	21", 533 mm
Nominal Impedance*	1, 2, or 4 Ω
Power Rating*
Program Power	5000 W
Watts (AES)	2500 W
Resonance	30.67 Hz
Usable Frequency Range	25 Hz - 0.6 kHz
Sensitivity*	95.0 dB
Magnet Weight	45 oz.
Gap Height	0.75", 19 mm
Voice Coil Diameter	6", 152 mm
Mirror Image Twin Spiders	13 mm Spacing
THIELE & SMALL PARAMETERS
Resonant Frequency (fs)	30.67 Hz
DC Resistance (Re)	2,9 Ω
Coil Inductance (Le)	1.2m H
Mechanical Q (Qms)	10.38
Electromagnetic Q (Qes)	0.33
Total Q (Qts)	0.32
Compliance Equivalent Volume (Vas)	224.58 liters / 7.93 cu.ft.
Peak Diaphragm Displacement Volume (Vd)	3448.2 cc
Mechanical Compliance of Suspension (Cms)	0.05 mm/N
BL Product (BL)	30.5 T-M
Diaphragm Mass Inc. Airload (MMs)	551 grams
Efficiency Bandwidth Product (EBP)	92.68
Maximum Linear Excursion (Xmax)	21 mm
Surface Area of Cone (Sd)	1642 cm2
Maximum Mechanical Limit (Xlim)	40.4 mm
MOUNTING INFORMATION
Recommended Enclosure Volume
Sealed	122.61–181.79 liters/4.33–6.42 cu.ft.
Vented	155.74-481.39 liters / 5.50-17.00 cu.ft.
Driver Volume Displaced	0.379 cu.ft. / 10.72 liters
Overall Diameter	21.65", 549.9 mm
Baffle Hole Diameter	19.83", 503.7 mm
Front Sealing Gasket	YES
Rear Sealing Gasket	N/A
Mounting Holes Diameter	0.34", 8.6mm
Mounting Holes B.C.D.	20.67", 525mm
Depth	10.39", 263.9 mm
Net Weight	48.1 lbs, 21.82 kg
Shipping Weight	51.6 lbs, 23.41 kgs
MATERIALS OF CONSTRUCTION
Coil Construction	I/O Copper voice coil
Coil Former	Fiberglass former
Magnet Composition	Neodymium magnet
Core Details	Vented motor

Basket Materials	Die-cast aluminum basket
Cone Composition	Wet pressed, X5 cone pulp
Cone Edge Composition	Advanced Polycotton surround
Dust Cap Composition	Wet pressed, X5 dust cap pulp

Spec Sheet and Cab Designs

Download Spec Sheet Download Cab Design

Frequency Response

Pro Audio

N210T-8 1" Throat Size HF Device - Neodymium - 8 ohm

NSW6021-124 21" Speaker

APT200S 5.9" X 5.9" Horn Flare