SKU 1146
5 1/4-inch coaxial loudspeaker

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.

Dimensions - Cut-Out Diameter 4 5/8 (11.75cm) "
Dimensions Full-Range Mounting Depth - Bottom Mount 2 13/16 (7.14cm) "
Dimensions Full-Range Mounting Depth - Top Mount 2 3/8 (6.03cm) "
Dimensions Grille - Height 13/16 (2.06cm) "
Driver Complement Mid / Woofer - Diameter 5 1/4 (13.34cm) "
Driver Complement Mid / Woofer - Quantity 1
Driver Complement Mid / Woofer - Type Dynamic Balance driver with poly-composite cone
Driver Complement Tweeter - Diameter 1 (2.54cm) "
Driver Complement Tweeter - Quantity 1
Driver Complement Tweeter - Type Soft dome
Electrical - Efficiency 92 dB
Electrical - Nominal Impedance 2.7 ohms
Electrical - Total Frequency Response 50-25kHz
Electrical Power Handling - Continuous 90 watts
Electrical Power Handling - Peak 200 watts
Shipping - Unit of Measure pair
Warranty - Speaker Warranty 1 year parts and labor (original purchaser)