Marine Certified: This Polk MM Series speaker is built to
withstand exposure to moisture, salt water, high humidity, UV rays, and a wide
temperature range so they work well in a marine environment, such as a boat. The
speaker has passed rigorous hours of salt fog and UV testing. The speaker also
features a completely sealed front design to prevent water intrusion. In
addition, they include stainless mounting hardware for corrosion and rust
Woofer Cones: Woven glass composite cones feature tremendous
stiffness-to-mass ratio. Lower mass means faster transients and finer detail.
Butyl Rubber Surrounds: For a smoother response and improved
durability, the woofers use butyl rubber surrounds. The airtight rubber
surrounds stand up to moisture, sunlight and extreme temperatures while allowing
long excursion linear motion and years of reliable use.
Separate Tweeters: The 1" silk/polymer
composite tweeters provide clear, detailed highs. The attached 19" wire is
connected to the tweeter terminals on the back of the woofer. Mounting dimensions:
Neodymium Magnets: The woofer's neodymium magnets offer
exceptional strength to performance ratio and are extremely lightweight.
Large Diameter Voice Coils: Large diameter, 30mm voice coils
increase the woofer's reliability and power handling capacity.
Carbon Composite Basket: The woofer's carbon composite
basket is lightweight and will not flex during music audio peaks.
Built-In Crossovers: A sealed crossover assembly is built
onto the back of each woofer; no need to find room to hide an external box.
Built-On Grilles: The woofer's grilles are not removable.
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