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


8 inch subwoofer optimized for small sealed enclosures

Available Finishes:

More Control, More Power, More Everything

This little subwoofer will let you run with the big bass dogs. It delivers truly big bass, from a truly small conveniently-sized subwoofer with all the great features of the larger dX Subs. It's optimized for small sealed enclosures (.33 cubic feet), and delivers deep, tight, musical bass. It may be small, but it has room for all the great dX Sub Series features.

The dX8 features:

  • 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-allows awesome low frequency tuning in small enclosures (.33 cu. ft.).
  • Thick ABS dustcap-prevents distortion due to the build up of air pressure behind the cap.
  • High durometer rubber surrounds-provides 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 do not dry rot like the foam surrounds used by other manufacturers.
  • Extra long, precision wrapped, 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-allowing you to choose the impedance that suits your personal system design, including exotic isobaric and push-pull types.

Driver Complement

Diameter8" (20.32cm) 
TypePolymer Composite Cone 


Total Frequency Response20-500hz 
Nominal Impedance4 ohms
Efficiency84 dB
Power Handling
Continuous200 watts
Peak400 watts
Voice Coil
Driver Diameter2" (5.08cm) 
Magnet Weight40.00 pounds

Thiele / Small Parameters

Resonant Frequency30Hz Hz
VD.022 cu ft 
Xmax Linear.343in / 8.7mm 
Xmax Mechanical1.0in / 25.4mm 
Winding Width1.0in / 25.4mm 
BL13.4 Testla Meters 
CMS222.5 Micro Meters 
Recommended Enclosure.33 cubic feet sealed 
LE1.5mH mH
SD.230sq ft / .0214sq m 
VAS.51cu ft. / 14.29L 
Driver Weight8 lb 3oz pounds


Cut-Out Diameter7 5/16" (18.57cm) 
Driver Mounting Depth
Top Mount4" (10.16cm) 
Bottom Mount4 1/5" (10.67cm) 
Product Weight (each)8.30 pounds


Speaker Warranty1 Yr 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.

dX8-4 Media

dX8-4 Literature

Want to know more? Want to dig just a little deeper to learn about this product? Here's a list of source material that will give more detail, other perspectives, and answer questions you may have.

dX8-4 Accessories