Car Subwoofers

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



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American Power, Italian Finesse

This big beautiful 12" subwoofer is the movie star of subwoofers: An Errol Flynn with sweltering Rudolph Valentino looks. This is the sub that gets the girls.

  • Polk/MOMO is built tough and backed by a three year Parts and Labor warranty, the best warranty in the car speaker world.
  • The MM120 features the industry's strongest poly/graphite cone set in its sleek sexy cast aluminum MOMO Arrow basket. This is metal, with rugged pro-grade nickle-plated binding posts and a giant 4lb magnet to blow you away.
  • The high mass MOMO Red ABS dust cap delivers shattering low frequency response.
  • And it's all cooled for high power by a two-inch, four-layer vented voice coil and pole piece, with even more cooling provided by an exclusive integrated rear spider vent.

This is a monster sub, for the coolest of cars only. Optimized for small enclosures, and built to shake you up.

Polk Audio/MOMO High Performance Car Audio Speakers are built 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.

For more information on Polk/MOMO components visit Polk/

Driver Complement

Diameter12" (30.48cm) 
TypePoly/Graphite Composite Cone 


Total Frequency Response20-200 Hz 
Nominal Impedance4 ohms
Efficiency87 dB
Power Handling
Continuous500 watts
Peak1000 watts
Voice Coil
Driver Diameter2" (5.08cm) 
Magnet Weight66.00 pounds

Thiele / Small Parameters

Resonant Frequency30 Hz
VD.062 cu ft 
Xmax Linear.3343 in / 8.7 mm 
Xmax Mechanical1.0 in / 25.4 mm 
Winding Width1.0 in / 25.4mm 
Recommended Enclosure.88 cubic foot sealed 
LE1.3 mH
SD.553 sq ft / .0514 sq m 
VAS2.15cu ft. / 61L 
Driver Weight15lbs 2 oz / 6.8kg pounds


Cut-Out Diameter11 1/8" (28.26cm) 
Driver Mounting Depth
Top Mount6 313/10000" (15.32cm) 
Bottom Mount6 1/2" (16.51cm) 
Product Weight (each)15.00 pounds


Unit of Measureeach 


Speaker WarrantyLimited, 3 Year Parts and Labor 

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.

MM120 Media

MM120 Literature

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Series Catalogs

MM120 Accessories