Polk Audio MM840 8” Subwoofer

Polk Audio MM840 8” Subwoofer

Polk Audio


Designed to Perform

The MM840 high performance 8-inch subwoofer maybe compact for a subwoofer but it cranks out waves of bass. As a result of 3 years of Polk research and development, every woofer and driver in the MM Series has been designed to offer unparalleled sound quality with exceptional fit to meet virtually any application. Borrowing technology from our flagship SR Series, the MM Series offers outstanding performance for your mobile audio dollar. With 250 Watts continuous/500 Watts peak power handling, the MM840 is recommended for small sealed (.35 cubic foot) enclosures.

MM840 Features:

・New polymer woofer cones and butyl rubber surrounds will not break down over time and will survive the rigors of harsh automotive environments.
・High temperature copper voice coil (51mm) and polyamide former withstands the most rigorous use while maintaining extremely low distortion for bass punch and output.
・Heavy duty input terminals accommodate speaker wire up to 8 AWG or twisted pairs of 12 AWG.
・Advanced 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 woofer.
・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.
・Available matching grille complement the wheel spoke design.


Cut-Out Diameter: 7 1/8" (18.10cm)
Mounting Depth - Bottom Mount: 4 11/16" (11.91cm)
Mounting Depth - Top Mount: 4 1/8" (10.48cm)
Subwoofer - Diameter: 8" (20.32cm)
Subwoofer - Type: Dynamic Balance poly composite woofer
Efficiency: 90 dB
Total Frequency Response: 26-200Hz
Power Handling - Continuous: 250 watts
Power Handling - Peak: 500 watts
Voice Coil - Driver Diameter: 1 1/2" (3.81cm)

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