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The Premium Upgrade—tuned to provide the unparalleled sonic accuracy you’ll find in studio monitor speakers, but in a durable, ultra-marine certified design, Polk’s MM1 Series mobilizes high-quality sound for an on-the-go audio upgrade that’s way beyond anything you’ll experience from the stock factory set up in your car, boat, motorcycle or ATV.



  • Premium Audio Upgrade for Car, Boat, Motorcycle, ATV
  • Ultra-Marine Certified (IP56 rated) for extra-long lasting protection
  • Santoprene S Roll Surrounds keep out water, dirt and dust


Designed to perform

Every element of the MM Series is meticulously engineered for high-performance sound. Dynamic Balance technology, a pivoting 1” terylene tweeter, lightweight neodymium motor structure, high-temp Conex spiders and oversized voice coils for increased power handling are brought together with 2nd order high & low pass crossovers for optimum system blending—in short, your vehicle might just become your favorite listening environment.


Ultra-Marine Certified

MM1 Series have earned an Ultra-Marine Certified IP56 rating with their non-corrosive aluminum grilles and fiberglass reinforced ABS baskets, epoxy coated crossovers, water-proof inner and outer surrounds, weep holes for proper drainage and titanium-plated cones—that’s all been salt-fog, UV, and humidity tested. With MM1 Series, you get extra, long-lasting protection against virtually anything mother nature can dish out.


Designed To Go The Extra Mile

All Polk loudspeakers rely on our patented process to eliminate electro-acoustic and mechanical issues before they become a part of the finished speaker and are also rigorously tested through Polk’s Klippel distortion analyzers. MM1 Series, in addition to their IP56 waterproof rating and Ultra-Marine Certification feature Santoprene S Roll inner and outer surrounds to eliminate water, dirt and dust from entering the speaker housing. maximize throw, and withstand abuse from marine cleaning agents.

Compact lightweight neodymium motor structure provides more output with less power and overall higher efficiency—plus easier drop-in installation.


Non corrosive fiberglass reinforced basket offers heavy-duty protection for back half of the speaker, which helps prevent corrosion and general wear and tear.


With its second order high/low pass system, you’re ensured the right frequencies reach the right speakers in your setup for optimal system blending regardless of the vehicle you’re in or the elements you encounter.

Polk Audio MM522 5.25" Marine Certfied Coaxle Speaker Pair

SKU: MM522
Special Order

    • Qty Included 1 pair
    • Driver Enclosure Type Ultra-Marine Certified
    • Driver Complement• (1)  5.25" (13.34 cm) d (Round) Dynamic Balance Driver - Mid/Woofer
      • (1)  1" (2.54 cm) d (Round) Pivoting Terylene Tweeter - Tweeter
    • Shape Round
    • Diameter 4.6" (11.68 cm)
    • Full-Range Mounting Depth - Top Mount 2.36" (5.99 cm)
    • Full-Range Mounting Depth - Bottom Mount 2.56" (6.5 cm)
    • Shape Round
    • Depth 0.92" (2.34 cm)
    • Total Frequency Response 50 Hz → 40 Hz
    • Nominal Impedance 4 ohms
    • Max Sensitivity (1 watt @ 1 meter) 92 dB
    • Type 1st Order (Woofer) 2nd Order (Tweeter) at 5.0 kHz
    • Peak Power Handling 300 watts
    • Power Handling (per channel) 100 watts → 300 watts
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