This product is a vintage Polk model and is not available for sale, but it may still be available in some stores as a closeout or used product. The following text is taken from the original sales brochure for this product and does not reflect current availability. If you happen to have any question or concerns about this product, or any other Polk Audio product, feel free to contact our Customer Service Department at 1-800-377-7655 Monday - Friday, 9am - 5:30pm EST


5.25 inch coaxial loudspeaker with external crossover

Available Finishes:
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Championship Performance

Polk/MOMO Championship Performance car audio speakers are engineered by Polk Audio with ultra high-tech materials for competition-level performance and durability. They're styled exclusively by MOMO, the world's preeminent designer of racing accessories, to look as good as they sound. And for motor sports enthusiasts the world over, a MOMO product is a charismatic symbol of the finest quality.

When you consider your car an extension of your personality, Polk Audio/MOMO High Performance Car Audio is the perfect synthesis of technology and design.

MMC525 Technology & Features

  • Marine Certified Polk/MOMO speakers are built tough to withstand the toughest environments so they are perfect for use in boats of all types. That's why Correct Craft offers Polk/MOMO speakers in their award-winning Nautiques ski and wakeboarding boats. Professional wakeboarder Brian Francis choose Polk/MOMO speakers woofers and amps for his MasterCraft boat and Chevy Avalanche truck for maximum entertainment and excitement on the road and wave.
  • Woven Dynamic Balance Carbon Fiber Cone provides the ideal balance of stiffness and low mass for the clearest, most detailed midrange performance, and lowest distortion, of any speaker in its class.
  • 25mm Liquid-Cooled Silk/Polymer Composite Dome Tweeter with Neodymium magnet for clear, detailed highs.
  • 15º Swivel Tweeter Housing delivers direct, detailed imaging; instantly adjustable through the grille.
  • Channel vented, acoustically inert rustproof Cast Aluminum Basket for superior stiffness and better heat dissipation.
  • By-passable, vented Outboard 2nd Order x2 (High and Low) Crossover with big, beefy components for better dynamic impact and transparency. Vented Crossover Housing has multiple mounting options (screw or "zip" tie) for the ultimate system installation choices. Mating "fastons" for hassle free connections.
  • Muscular ABS Grilles based on exclusive MOMO rim designs.
  • Airtight Rubber Surround stands up to moisture, sunlight and extreme temperatures while allowing long excursion linear motion and years of reliable use.
  • Strong, fire-retardant flat NOMEX® Spider allows extended linear motion while providing highly reliable mechanical and thermal stability.
  • Laser-based, Klippel-optimized, channel vented 2-Layer 25mm Kapton Voice Coil and Former for high heat dissipation (Kapton's melting temperature is 725°F/400°C!) and extreme power handling.
  • Waterproof, anti-resonance PVC Magnet Boot, removable for more install flexibility.
  • Dual Nickel Plated Polarized Terminals for component-like connections. Truly "bi-ampable"! (all models except MMC460)
  • Built tough and backed by a three-year parts & labor warranty, one of the best warranties in the car audio world.

Driver Complement

Diameter1" (2.54cm) 
TypeSilk/Polymer composit dome 
Mid / Woofer
Diameter5 1/4" (13.34cm) 
TypeWoven Carbon Fiber with rubber surround 


Total Frequency Response53Hz-25KHz 
Nominal Impedance4 ohms
Efficiency89 dB
Power Handling
Continuous70 watts
Peak140 watts


Cut-Out Diameter4 5/8" (11.75cm) 
Driver Mounting Depth
Top Mount without Cup2 5/16" (5.87cm) 
Bottom Mount without Cup2 1/2" (6.35cm) 
Top Mount2 5/8" (6.67cm) 
Bottom Mount2 3/4" (6.99cm) 
Tweeter Mounting Depth
Surface Mount Height1/2" (1.27cm) 


Speaker Warranty3 years parts and labor (original purchaser) 

Specifications, dimensions and features subject to change without notice. For more information call us at 1-800-377-7655 (USA and Canada). Outside of North America call +1 (410) 358-3600.

MMC525 Media

MMC525 Literature

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Series Catalogs

MMC525 Accessories