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 single voice coil 4 Ohm subwoofer

Available Finishes:
Additional Images

Incredible Sound/Affordable Price

  • "dish" Polypropylene cone supported by a vented cone/coil coupler stiffens the cone for greater mechanical stability and lower distortion.
  • Marine Certified Polk db Series speakers are built tough to withstand the toughest environments so they are perfect for use in boats of all types. That's why Correct Craft offers Polk Audio speakers in their award-winning Nautiques ski and wakeboarding boats.
  • Santoprene surround is impervious to extremes in temperature, humidity and exposure to sunlight for excellent long term reliability.
  • Fire-retardant flat NOMEX Spider allows extended linear motion while providing highly reliable mechanical and thermal stability.
  • Triple venting of the 4-layer Kapton Voice Coil Former, Cone/Coil Coupler and Pole Piece contribute to the high power handling and reliability of the db Series subs.
  • As with all Polk Audio subwoofers, the voice coil alignment, motor and suspension were optimized using a state-of-the-art Klippel laser analyzer. The result is superior cone travel linearity for flatter response and lower distortion.
  • Dual Voice Coil version also available - db804DVC

Driver Complement

Diameter8" (20.32cm) 


Total Frequency Response30-200 
Nominal Impedance4 ohms
Efficiency85 dB
Power Handling
Continuous180 watts
Peak360 watts
Voice Coil
Driver Diameter1 1/2" (3.81cm) 

Thiele / Small Parameters

Resonant Frequency47 Hz
Xmax Linear0.24 inch / 6.1 mm 
Xmax Mechanical1.0 inch / 25.4 mm 
Recommended EnclosureSealed / Ported / Bandpass 
LE1.11 mH
SD35.65 sq in 
VAS0.42cu. ft. / 11.95 L 


Cut-Out Diameter7 1/16" (17.94cm) 
Driver Mounting Depth
Top Mount4" (10.16cm) 
Bottom Mount4 9/16" (11.59cm) 


Speaker Warranty1 year parts and labor (original purchaser) 

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.

db804 Media

db804 Literature

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Series Catalogs

db804 Accessories