Polk Audio 8" SVC DB+-Series Subwoofer with Marine Certification

Model: DB842SVC UPC: 747192128173 Item: 169065


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Product Information

DB+ Series 8" Single Voice Coil Subwoofer with Marine Certification


  • Delivers rich, deep bass in nearly any vehicle for whenever you’re on the on the go
  • Space-saving design reduces the need for oversized subwoofer enclosures
  • Dynamic Balance technology provides rich, clean, full-range sound by eliminating distortion and unwanted resonant frequencies
  • Marine certified with IP56 rating (water- and dirt-resistant) and tested for salt-fog, UV and humidity

DB+ Series

Everything you love about Polk’s Dynamic Balance technology—that rich, clean, full-range sound—is built into the marine-tough, yet ruggedly sophisticated, DB+ series. And with its universal fit, it can be installed in any vehicle: Automobiles, motorcycles, boats, ATVs—you name it.

Rich, Deep Bass

Delivers thunderous sonic output and powerful low frequency response wherever you go.

Space-Saving Design

Slimmed down form factor reduces the need for oversized subwoofer enclosures for a look that goes virtually unnoticed—but a sound that doesn’t. Fits in any enclosure or application.

Dynamic Balance Technology

Enjoy a rich, clean, full-range sound with Polk's patented Dynamic Balance technology engineered into every DB+ speaker. Rigorously tested and developed by Polk's talented Polk Audio engineers, whose passion rests in the principles of great sound, Dynamic Balance technology features non-resonant materials so you get extremely clear highs, mids, and lows no matter what you’re listening to.

Marine Certified

The DB+ Series is IP56 rated so it’s dirt- and water-resistant. It also has been tested for salt-fog, UV, and humidity. A big part of that marine certification also means that each speaker has a non-corrosive plastic grille, a polypropylene UV tolerant cone, waterproof inner and outer surrounds, and stainless steel mounting hardware, ensuring that it’s fully protected against the elements.

Polypropylene UV Tolerant Cone

Enjoy the peace of mind knowing each speaker cone is built to last, whose clean and polished look won’t discolor or degrade over time while giving heavy low frequency sound the high-performance it deserves.

Waterproof Santoprene Surround

This attractive high performance material maximizes throw with its ultra-flexible, ultra-durable properties—and prevents the elements from entering the speaker unit. Plus, it combats the harsh effects of boat cleaning agents.




  • Total pieces: 1


  • Included accessories: (1) Stainless steel mounting hardware


  • Drivers warranty: 1 year
  • Original purchaser only: Yes


  • Driver enclosure type: Ultra-marine certified
  • Driver complement: (1) 8" (20.32 cm) d (Round) - Subwoofer

Cut-Out Dimensions

  • Shape: Round
  • Diameter: 7.28" (18.49 cm)
  • Full-range mounting depth - Top mount: 3.82" (9.7 cm)
  • Full-range mounting depth - Bottom mount: 4.02" (10.21 cm)

Audio Quality

  • Total frequency response: 30 Hz → 200 kHz
  • Sensitivity (1 watt @ 1 meter): 84 dB


  • Continuous power handling: 250W
  • Peak power handling: 750W

What's in the Box

What's in the Box:

  • One DB842SVC subwoofer
  • Stainless steel mounting hardware
  • Owner's manual


Customer Reviews for Polk Audio 8" SVC DB+-Series Subwoofer with Marine Certification

5.0 / 5.0
1 Review
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1 Star
Excellent bargain
mounted it yet but I did put it in a generic cab just to hear it.Csnt wait to build a cab for it although the one disappointment is the lack of T/S parameters for plugging into WinISD and the like.
May 11, 2019
1 year ago


Customer Q & A

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Browse 2 questions Browse 2 questions and 2 answers
Is there any information on port length for the ported configuration?
Jay P on Jul 31, 2020
  Hi there and thanks for contacting us! Unfortunately, Polk does not give this information in any of their manuals. Sorry!
where are the t/s parameters?
A shopper on Apr 18, 2019
  Hello! I'm sorry, but Polk doesn't provide that information to us, so I'm afraid I can't answer that question.