Polk Audio DB572 5 x 7 Coaxial Speaker for Car & Marine - Durable

In this review the Polk Audio DB572 is assessed as a versatile 5 x 7 coaxial speaker aimed at drivers and boat owners who want louder, clearer sound without replacing an entire system. The bottom line: this speaker is best for those who need a weather-resistant, easy-to-install upgrade that delivers strong bass and clean highs thanks to a built-in crossover and Polk's Dynamic Balance technology. It performs well in both car and freshwater marine environments and offers a solid balance of power handling and durability for custom installs.

Key Features

• Marine certification and coating: IP56-rated construction and coated steel baskets resist salt-fog, UV and humidity for dependable use in boats and exposed vehicles.
• Power handling: 225W peak and 75W RMS capability lets these speakers play loud without obvious strain when paired with proper head units or amps.
• Driver design: The 5 x 7 polypropylene woofer cone and strong rubber surround deliver punchy low-end and long-term durability in damp environments.
• Tweeter and crossover: The 3/4 in silk dome tweeter and built-in crossover direct highs and lows to the right drivers for clearer vocals and detailed high frequencies.
• Resonance control: Polk's Dynamic Balance laser-imaged design reduces distortion for wide, cleaner sound dispersion across listening positions.
• Installation hardware included: Mounting hardware is supplied and the grilles (sold separately) let installers add a finished look to custom speaker locations.

Who It's For

The DB572 is ideal for car audio enthusiasts and boat owners who want a dependable, splash-proof coaxial that improves factory sound without a complex install. It suits riders of motorcycles or ATVs and people with freshwater craft who need speakers able to withstand sun and moisture while delivering louder bass and crisp highs.

Those wanting extreme marine immersion resistance for offshore saltwater use or audiophiles seeking high-end component speaker sets with separate crossovers and tweeter placements should look elsewhere; the DB572 is a durable, practical coaxial upgrade rather than a boutique studio monitor.

Pros & Cons

Pros

• Clear output at high volumes thanks to built-in crossover and Dynamic Balance, as noted by multiple owners.
• Weather-tested IP56 rating and coated baskets make it suitable for freshwater marine and exposed outdoor use.
• Simple installation with included mounting hardware and flexible fit for some 6 x 8 applications.

Cons

• Some customers report mixed fit results, so measuring mounting depth and hole pattern is advisable before purchase.
• Grilles are sold separately, so a finished look may require an extra purchase for some installs.

Specifications

Speaker type	2-way coaxial car & marine speaker
Size	5 in x 7 in (fits some 6 x 8 applications)
Power handling	75W RMS, 225W peak
Impedance	4 ohm
Frequency response	35 Hz - 22 kHz
Woofer & tweeter	Polypropylene woofer cone; 3/4 in silk dome tweeter
Environmental rating	IP56 marine certification; salt-fog, UV and humidity tested

Our Verdict

The Polk Audio DB572 is a practical, value-oriented choice for anyone seeking a weather-resistant upgrade that improves clarity and bass in both car and freshwater marine settings. It combines Polk's Dynamic Balance resonance control, a silk dome tweeter, and robust construction to deliver reliable, loud performance, making it a good pick for functional installs where durability and honest sound matter.

Frequently Asked Questions

Are these speakers truly marine rated?
Yes, the DB572 carries an IP56 marine certification and Polk tests for salt-fog, UV and humidity for freshwater marine and exposed use.

Do grilles come with the speakers?
Mounting hardware is included but grilles are sold separately, so plan for a separate purchase if you want a finished look.

Will these fit a 6 x 8 opening?
The 5 x 7 design can be used in some 6 x 8 applications, but verify mounting pattern and depth before installation.