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Polk Audio DB402 DB+ Series 4″ 135W Coaxial Speakers with Marine Certification

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SKU: DB402
On Sale Now! 26% Off!

$149.00 $110.65

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Polk Audio DB+ Series 4″ 135W Coaxial Speakers with Marine Certification: Polk DB+ Series Speakers Offer Premium Quality Without the Price Tag



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.

Polk Audio DB402 Features:

  • High performance audio upgrade that delivers signature quality sound that goes beyond OEM factory systems
  • Marine certified with IP55 rating (water- and dirt-resistant) and tested for salt-fog, UV and humidity
  • Polypropylene and UV tolerant cone with waterproof inner and outer surrounds
  • Simple drop-in installation for any vehicle including cars, boats, ATVs—you name it

High Performance Upgrade

Upgrade from your OEM speaker system toward a bigger, fuller, high-performance sound. The high-grade materials used in our DB+ Series ensure you get an audio system that’s designed and engineered to last much longer than your factory setup.

Marine Certification

The DB+ Series is IP55 rated so it’s dirt- & 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 that important low end sound the high-performance it deserves.

Waterproof Inner and Outer Surrounds

Completely blocks dirt, liquid and grime from entering the speaker housing, which helps minimize corrosion and maximize longevity of the entire speaker and its housing basket.

Universal Fit

Enjoy a simple drop in installation for any vehicle including cars, boats, ATV’s — you name it. This quick and easy experience also ensures a faster installation process so you can get back to what matters with our great sound always along for the ride.

Zero Tweeter Protrusion

Each speaker in the DB+ Series features a shallow tweeter design to ensure your factory speaker grille re-installs with ease for a flush, seamless look.

Polk Audio DB402 Specs

Weight 1.59 kg
Dimensions 0.56 cm
Model Name

DB+ Series 4" 135W Coaxial Speakers with Marine Certification




Polk Audio

Total Pieces


Drivers Warranty

1 years

Original Purchaser Only


Qty Included


Driver Enclosure Type

Marine Certified

Driver Complement

• (1) 4" (10.16 cm) d (Round) – Mid/Woofer
• (1) 0.75" (1.91 cm) d (Round) – Tweeter


4.09" (10.39 cm)

Full-Range Mounting Depth - Top Mount

1.79" (4.55 cm)

Full-Range Mounting Depth - Bottom Mount

2" (5.08 cm)




0.55" (1.4 cm)

Continuous Power Handling


Peak Power Handling


Total Frequency Response

60 Hz → 22 Hz

Nominal Impedance

4 ohms

Sensitivity (1 watt @ 1 meter)

90 dB

Polk Audio in Australia: Innovating Car Audio Experiences

Polk Audio is an established name in the world of sound technology, known for its commitment to innovation, sound quality, and durability. The brand has made significant inroads into the Australian market, becoming a popular choice among audio enthusiasts, especially in the car audio segment.

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