12SW-4Subwoofer Drivers

12" Poly Cone Subwoofer 4 Ohm

Our 12SW-4 poly cone replacement subwoofer is a favorite among DIY enthusiasts, repair techs, and professional installers. Versatile and powerful enough to be used in home theater systems and car audio applications, the 12SW-4 is a cinch to implement in new projects, and most often an upgrade when used to replace blown or damaged subs.

Product Details

Now you can replace blown or damaged subwoofers with new drivers that equal or outperform the original! Our 12SW-4 poly cone subwoofer is not only the perfect replacement for tired, worn-out subwoofers in a variety of audio gear, but they are also a great choice for new designs. The handsome polypropylene cone provide durability and good looks, while the large vented magnet assembly and extended voice coil enable long-throw performance and authoritative bass in a variety of enclosures.


The 12" model features a 2" diameter voice coil with big 8.5mm excursion for solid bass performance in compact sealed and vented enclosures. These versatile subs are also rugged enough for use in dipole and automotive infinite baffle applications.


See the below list of recommended enclosure alignments for new design.


Recommended sealed enclosure: Vb = 1.5 ft^3, F3 = 37 Hz, Qtc: 1.6


Recommended vented enclosure: Vb = 2.5 ft^3, Fb = 32 Hz, F3 = 30 Hz


Quick Facts

  • Large 2" voice coil and bumped back plate enable high power handling
  • Butyl rubber surround ensures high excursion and long-term durability
  • Polypropylene cone for perfect balance of stiffness, mass, and self-damping
  • Long-throw design for deep, powerful bass


Product Specifications

Nominal Diameter12"
Power Handling (RMS)120 Watts
Power Handling (max)240 Watts
Impedance4 ohms
Frequency Response29 to 800 Hz
Sensitivity88 dB 2.83V/1m
Voice Coil Diameter2"

Thiele-Small Parameters

Resonant Frequency (Fs)29.6 Hz
DC Resistance (Re)3.57 ohms
Voice Coil Inductance (Le)1.1 mH
Mechanical Q (Qms)4.51
Electromagnetic Q (Qes)1.27
Total Q (Qts)0.98
Compliance Equivalent Volume (Vas)3.18 ft.³
Maximum Linear Excursion (Xmax)8.5 mm

Materials of Construction

Cone MaterialPoly
Surround MaterialRubber
Voice Coil Wire MaterialCopper
Basket / Frame MaterialSteel
Magnet MaterialFerrite

Mounting Information

Overall Outside Diameter12.25"
Baffle Cutout Diameter11.125"
Bolt Circle Diameter11.75"
# Mounting Holes8