MM1 Series 5.25" Coaxial Speakers with Ultra-Marine Certification

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.


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.

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.

Dynamic Balance Technology

Integrated Epoxy Coated Crossovers

Why Polk Audio

Five Decades Of American Loudspeaker Engineering

DB+ Series benefits from decades of Polk’s premium loudspeaker engineering experience and were designed at our original Acoustic Research and Development facility in Owings Mills, Maryland.

Our goal since 1972 has been to build great speakers that not only play loud, but also play crystal clear sound with effortless bass. The result of this 50-year engineering heritage is best-in-class loudspeakers backed by numerous awards, patents, and fans like you.

We’ve achieved this by constant innovation and by leaving nothing to chance. Accessibly priced, built to exceed our patented, quality-testing process, and designed to provide Polk’s legendary audio quality, the MM1 Series fulfills the Polk promise of great sound for all.

Companion Products


MM1 Series Premium 5x7" Coaxial Speakers with Ultra-Marine Certification



MM1 Series 8" Single Voice Coil Subwoofer with Ultra-Marine Certification



MM1 Series 8" Dual Voice Coil Subwoofer with Ultra-Marine Certification