Questions? Feedback? powered by Olark live chat software

B&C 21SW152-4 21" Neodymium Subwoofer 4 Ohm

(No reviews yet) Write a Review
49.00 LBS
Free Shipping
  • B&C 21SW152-4 21" Neodymium Subwoofer 4 Ohm
  • B&C 21SW152-4 21" Neodymium Subwoofer 4 Ohm
  • B&C 21SW152-4 21" Neodymium Subwoofer 4 Ohm


B&C's 21SW152 21" subwoofer driver features a massive 260 square inches of diaphragm surface area—nearly 40% more than an 18" driver and equal to double the Sd of a typical 15".

  • 4,000 watt continuous program power capacity
  • 6" diameter, 1" long split winding copper voice coil wound on fiberglass former
  • 15 mm Xmax, 60 mm peak-to-peak excursion before damage
  • Neodymium ring magnet allows a very high force factor and linear excursion
  • Ventilated voice coil gap for reduced power compression
  • Aluminum demodulating ring decreases distortion
  • Double silicone spider with optimized compliance

Product Details

B&C 21SW152-4 21" Neodymium Subwoofer 4 Ohm

The B&C Speakers 21SW152 21" subwoofer's 6" diameter voice coil with a 1" copper winding length provides great Xmax (15 mm) and impressive power handling (2,000 watts RMS). Despite the driver's size, a high-strength neodymium ring magnet keeps overall weight as low as possible. The 21SW152 will deliver nearly unmatchable low frequency output when loaded into vented or horn loaded enclosures. Perfect for high output concert and nightclub applications.

Product Specifications
  • Nominal Diameter21"
  • Power Handling (RMS)2,000 Watts
  • Power Handling (max)4000 Watts
  • Impedance4 ohms
  • Frequency Response30 to 1,000 Hz
  • Sensitivity96 dB 1W/1m
  • Voice Coil Diameter6"
Thiele-Small Parameters
  • Resonant Frequency (Fs)32 Hz
  • DC Resistance (Re)3.4 ohms
  • Voice Coil Inductance (Le)1.5 mH
  • Mechanical Q (Qms)7
  • Electromagnetic Q (Qes)0.31
  • Total Q (Qts)0.3
  • Compliance Equivalent Volume (Vas)7 ft.³
  • BL Product (BL)32.5 Tm
  • Diaphragm Mass Inc. Airload (Mms)460g
  • Maximum Linear Excursion (Xmax)15 mm
  • Surface Area of Cone (Sd)1680 cm²
Materials of Construction
  • Cone MaterialTreated Paper
  • Surround MaterialCloth
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerFiberglass
  • Basket / Frame MaterialCast Aluminum
  • Magnet MaterialNeodymium
Mounting Information
  • Overall Outside Diameter21.5"
  • Baffle Cutout Diameter20"
  • Depth10.3"
  • Bolt Circle Diameter20.7"
  • # Mounting Holes8
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume0.93 ft.³
  • Sealed F393 Hz
  • Vented Volume2.22 ft.³
  • Vented F358 Hz
B&C 21SW152-4 21" Neodymium Subwoofer 4 Ohm
  • BrandB&C Speakers
  • Model21SW152-4
  • Part Number294-689
  • UPC844632086144
  • Unit of MeasureEA
  • Product Rating
    (6 Reviews)
  • Weight48.45 lbs.
View AllClose