Car Subwoofers

This product is a vintage Polk model and is not available for sale, but it may still be available in some stores as a closeout or used product. The following text is taken from the original sales brochure for this product and does not reflect current availability. If you happen to have any question or concerns about this product, or any other Polk Audio product, feel free to contact our Customer Service Department at 1-800-377-7655 Monday - Friday, 9am - 5:30pm EST


12 inch 8 Ohm subwoofer optimized for small sealed enclosures

Available Finishes:

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More Control, More Power,
More Everything

It's the biggest, baddest, most bass-happy Polk dX Subwoofer, optimized to deliver explosive bass performance in small sealed enclosures (less than 1 cubic foot). Deep, tight, musical bass -- just what you expect from Polk Audio!

dX Subwoofers feature:

  • Polymer and graphite composite cones -- the stiffest cones in the autosound industry! Able to withstand the enormous pressures generated inside small enclosures without breakup and distortion.
  • High mass cones allow awesome low frequency tuning in small enclosures.
  • Thick ABS dustcaps prevent the distortion that can be caused by the build up of air pressure behind the cap.
  • High durometer rubber surrounds provide a much tighter and more durable air seal behind the cone than foam, paper, or cloth surrounds; for deep, tight, quick bass. Also, rubber surrounds don't dry rot like the foam surrounds used by other manufacturers.
  • Extra long, precision wrapped and vented coils for superior cooling and high power handling.
  • Four layer, 2" voice coil handles the heat generated when your amp is really cranking.
  • Vented pole piece lets air circulate over the voice coil to keep it cool and in control even when the bass is really thumping.
  • 8 Ohm and 4 Ohm versions available: Choose the impedance that suits your personal system design, including exotic isobaric and push-pull types.

If you're serious about your car stereo -- don't bother with cheap-o speakers. Go for the gusto of the dX Series Loudspeakers. They give you the ultimate in performance, flexibility, and control. They contain some amazing technology -- the kind that makes them tough enough to take the heat, and powerful and efficient enough to inspire many a road trip.

Driver Complement

Diameter12" (30.48cm) 
TypePolymer Composite Subwoofer 


Total Frequency Response20-200Hz 
Nominal Impedance8 ohms
Efficiency86 dB
Power Handling
Continuous400 watts
Peak800 watts
Voice Coil
Driver Diameter2" (5.08cm) 
Magnet Weight40.00 pounds

Thiele / Small Parameters

Resonant Frequency26.7 Hz
VD.062 cu ft 
Xmax Linear.293in / 7.48mm 
Xmax Mechanical1.0in / 25.4mm 
Winding Width.90in / 22.9mm 
Recommended Enclosure.88 cubic feet sealed 
LE2.5 mH
SD.553sq ft / .0514sq m 
VAS3.1cu ft 
Driver Weight8lbs 3oz / 3.7kg pounds


Cut-Out Diameter11 1/8" (28.26cm) 
Driver Mounting Depth
Top Mount5 1/4" (13.34cm) 
Bottom Mount5 3/5" (14.22cm) 
Product Weight (each)8.30 pounds


Speaker WarrantyLimited, 1 Year parts and labor 

Specifications, dimensions and features subject to change without notice. For more information call us at 1-800-377-7655 (USA and Canada). Outside of North America call +1 (410) 358-3600.

dX12-8 Media

dX12-8 Literature

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dX12-8 Accessories