Basket: The MM Series subwoofers use high-tech carbon composite basket
structures for light weight and maximum rigidity. They will not rust or flex
like stamped steel designs.
Materials: The new polymer woofer cone and butyl rubber surround will
not break down over time and will survive the rigors of harsh automotive environments.
Dual Voice Coils: The high temperature, 1-1/2" diameter copper voice
coils and polyamide former withstand the most rigorous use while maintaining extremely low
distortion. The MM840DVC features dual 4-ohm voice coils;
when wired in parallel the subwoofer presents a 2-ohm load, when wired in
series the subwoofer presents an 8-ohm load.
Terminals: The woofer has heavy duty spring terminals that will accept
single banana plugs, pin connectors, and bare wire up to 8 gauge.
Marine Certified: Polk MM Series speakers are built to withstand
exposure to moisture and UV rays, so they work well in boats and cars.
Klippel Measurement Technology: State-of-the-art laser based Klippel
measurement technology is used to optimize the woofer's motor structure, voice coil
alignment, and suspension to improve performance, even at extreme listening levels.
Sealed Box Volume: Polk recommends using this woofer
in a sealed enclosure; the ideal internal volume is 0.35 cubic feet.
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