butyl rubber
Polk Audio DB521 5.25-Inch Coaxial Speakers
- Pair of marine certified speakers perfect for use in boats of all types
- Equipped with a 0.75-inch liquid-cooled silk-polymer composite dome tweeter
- Maximum input power: 135 watts
- Equipped with a dynamic balance polymer/mica composite mineral-filled cone for a big sound
- Durable butyl rubber surround stands up to the stress of extreme temperatures, sunlight and time
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- High Quality Injection Cone
- Non-Fatiguing Butyl Rubber Surround
- 1”High Temperature Voice Coil
- 0.5” Titanium Neo-Tweeter
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- 2 Polymer Cone Midrange
- 2 x 0.5 Titanium Neo- Tweeter
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- Butyl Rubber Surround
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- 0.5Titanium Neo-Tweeter
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