6x9" Three Way Speakers with Ultra-Marine Certification (Pair)

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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.

  • Ultra-marine certified (IP56 rated)
  • Dirt & water-resistant & tested for salt-fog, UV & humidity
  • Used in Automobile, Boats & ATVs
  • 6" Dynamic Balance® polypropylene woofers
  • 1" & .75" Terylene Dome tweeters

  • In Stock




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All-weather sound

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.

Waterproof Santoprene Surrounds

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.


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

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.

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.

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Details & Specifications


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What size voice coil do the mm692 and mm652 speakers have?

Asked by: Kingofvtec
Hello, The MM692 features • (1) 6" (15.24 cm) h x 9"" (22.86 cm) w (Oval) - Mid/Woofer • (1) 1" (2.54 cm) d (Round) - Tweeter • (1) 0.75" (1.91 cm) d (Round) - Tweeter The MM652 features • (1) 6.5" (16.51 cm) d (Round) - Mid/Woofer • (1) 1" (2.54 cm) d (Round) - Tweeter
Answered by: Polk Audio
Date published: 2024-03-19

Are you able to confirm if these will fit in my 2020 Jeep Grand Cherokee Altitude? I believe I would need 2 sets correct, for the front and back?

Asked by: BlevinsT
Hello, These could fit but would require some retrofitting into the existing spots in your car. The better fit would be either DB552 or the DB5252 system. You would have to purchase two sets of the paired speakers for the front and back in either case.
Answered by: Polk Audio
Date published: 2024-03-14

Do you have spacers for these? I need 1.5".

Asked by: RV Eric
Hello, we do not supply 1.5" spacers for our speakers.
Answered by: Polk Audio
Date published: 2023-11-20

Hi. Can you please provide me with suggested sealed box volume measurements and or even better with the Thiele/Small parameters. I bought new, each speaker is getting 75wrms Free air isn't cutting it, I want to get some mid bass performance out of these.

Asked by: Pepperlips
Hello, Not being an expert in building speaker enclosures, I would have to say your question might be better answered by car or boat audio system installer.
Answered by: Polk Audio
Date published: 2023-11-10
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