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Polk Audio db840 8" Single 4 ohms db Series Car Subwoofer

Item #: 81439 Availability: In Stock
Mfg Part No.: db840 Condition: Brand New
(Marine Certified)


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Sale Price: $48.15
Retail: $99.99
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Polk Audio's db Series subwoofers give you trademark Polk performance without stressing your wallet. These subs combine high-tech materials with a laser-optimized motor structure for smooth, powerful bass response.

The db840 8" subwoofer boasts a rigid polypropylene cone and durable Santoprene™ surround built to handle big power over the long run. Polk Audio tests their subs rigorously for environmental effects caused by sun, moisture, and extreme temperature changes — they'll withstand whatever mother nature can throw at them. Polk Audio's marine certification means you can confidently take these subs out to sea and dive into some deep bass. Match a db sub to a suitable enclosure, and enjoy impressive low-frequency performance rarely found in this price range.


  • Polk Audio db840 8" Single 4 Ohms Marine Certified Subwoofer
  • Power Handling:
    • Peak: 360 watts
    • RMS: 180 watts
  • Impedance: Single 4 ohms
  • Polypropylene cone woofer
  • Santoprene rubber surround
  • Marine certified: capable of withstanding harsh marine environment
  • Vented coil coupler
  • Fire-retardant NOMEX spider with linear motion
  • Designed and aligned with Klippel laser analyzer
  • Triple vented 4-layer Kapton single 4 ohms voice coil
  • Frequency response: 30-200 Hz
  • Sensitivity: 85 dB
  • top-mount depth: 4"
  • sealed box volume: 0.35 cu. ft.
  • ported box volume: 0.6 cu. ft.
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