Polk Audio MM521 5.25” 2-Way Coaxial Speakers

Polk Audio MM521 5.25” 2-Way Coaxial Speakers

Polk Audio


Designed to Perform

Through the use of high-tech carbon composite baskets, powerful neodymium motor structures using oversized voice coils, and state-of-the-art woven glass composite cones, we offer high-end audio performance normally found only in the most expensive loudspeaker systems. In addition, these space age materials offer weight savings that can mean higher performance for your car or boat. Don't settle for factory-installed sound!

MM521 Features:

・Space age materials reduce weight of components while offering rock solid reliability, advanced looks and ultra high performance.
・Neodymium magnets a rare earth metal offering exceptional strength to performance ratio, found only in the most exotic speakers, saves tremendous weight. Don't let the sound system weigh your vehicle down. Since the magnet is smaller, the speaker can fit into more applications.
・Carbon composite basket based on the spokes of a wheel is lightweight, will not flex during peaks and looks great! Don't be afraid to show off the back of your speaker.
・Woven glass composite cones feature tremendous stiffness-to mass ratio. Lower mass means faster transients and finer detail.
・Klippel optimized components using a state-of-the-art Klippel distortion analyzer, Polk engineers were able to optimize the woofer's motor structure, voice coil alignment and suspension for the best possible performance, even at extreme listening levels.
・Large-diameter voice coils (30mm) in drivers increase reliability and power handling capacity.
・Swivel mount tweeters allow precise aiming of sound.
・Stylish grille is included.


Cut-Out Diameter: 4 5/8" (11.75cm)
Full-Range Mounting Depth - Top Mount: 2 3/8" (6.03cm)
Grille - Height: 13/16" (2.06cm)
Mid / Woofer - Diameter: 5 1/4" (13.34cm)
Mid / Woofer - Type: Dynamic Balance driver with poly-composite cone
Tweeter - Diameter: 1" (2.54cm)
Tweeter - Type: Soft dome
Efficiency: 92 dB
Nominal Impedance: 2.7 ohms
Total Frequency Response: 50-25kHz
Power Handling - Continuous: 90 watts
Power Handling - Peak: 200 watts

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