5.25" Coaxial Speakers with Ultra-Marine Certification
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.
Ultra-marine certified (IP56 rated)
Dirt & water-resistant & tested for salt-fog, UV & humidity
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.
Advanced High-Performance Sound
Every element of the MM1 Series is meticulously engineered for
high-performance sound—Dynamic Balance technology, a pivoting 1” Terylene
tweeter, UV tolerant titanium plated composite cones, lightweight neodymium
motor structure—plus, glass fiber formers, oversized voice coils and high-temp
Conex spiders for increased power handling.
UV Tolerant Titanium Plated Composite Cones
Provides tighter, cleaner, more accurate sonic dispersion—and won’t
discolor or degrade with time and heavy use.
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.
Enjoy a rich, clean, full-range sound with our patented Dynamic Balance technology engineered into every MM1 speaker. Rigorously tested and developed by our 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.
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.
Key Technologies
A non-corrosive fiberglass reinforced ABS basket, water-proof surround, weep holes for proper drainage and a polypropylene cone offer long-lasting protection that’s salt-fog and UV tested.
Proudly engineered and designed in Baltimore, Maryland, Polk products are crafted to meet high standards of quality, performance, and reliability, ensuring a premium audio experience that is the pinnacle of American Hi-Fi.
Polk’s exclusive lightweight Dynamic Balance® Polypropylene Cones deliver spectacular midrange clarity, punchy bass and high efficiency.
A non-corrosive fiberglass reinforced ABS basket, water-proof surround, weep holes for proper drainage and a polypropylene cone offer long-lasting protection that’s salt-fog and UV tested.
Proudly engineered and designed in Baltimore, Maryland, Polk products are crafted to meet high standards of quality, performance, and reliability, ensuring a premium audio experience that is the pinnacle of American Hi-Fi.
Polk’s exclusive lightweight Dynamic Balance® Polypropylene Cones deliver spectacular midrange clarity, punchy bass and high efficiency.
Compare Polk Car & Marine Speakers
This Product
MM522
5.25" Coaxial Speakers with Ultra-Marine Certification
A non-corrosive fiberglass reinforced ABS basket, water-proof surround, weep holes for proper drainage and a polypropylene cone offer long-lasting protection that’s salt-fog and UV tested.
Proudly engineered and designed in Baltimore, Maryland, Polk products are crafted to meet high standards of quality, performance, and reliability, ensuring a premium audio experience that is the pinnacle of American Hi-Fi.
Polk’s exclusive lightweight Dynamic Balance® Polypropylene Cones deliver spectacular midrange clarity, punchy bass and high efficiency.
