Features

High Efficiency Design: The Polk Audio DXi Series speakers feature a high efficiency design; meaning better sound and more volume using less power.

Dynamic Balance Driver Technology: Dynamic Balance is a proprietary Polk Audio technology using laser imaging to determine what combination of speaker materials create the least resonance. Eliminating resonance in speakers results in a wide, smooth response and low distortion.

Klippel Optimized Components: For a driver to reproduce complex sounds accurately, the cone must move exactly the same distance and manner in both directions. The Klippel distortion analyzer, a device that uses a laser and sophisticated software to do large-scale analysis of drivers in motion, lets Polk optimize the speaker's motor structure, voice coil alignment, and suspension to yield the best possible performance.

Composite Cones: Each Polk DXi 690 speaker features a Dynamic Balance, polymer/mica composite cone woofer. These composite cones feature tremendous stiffness-to mass ratio. Lower mass means faster transients and finer detail.

Rubber Surrounds: For a smoother response and improved durability, the speaker uses rubber surrounds.

Silk Dome Tweeters: The DXi 690s feature a 1" silk/polymer dome tweeter and a 3/4" silk/polymer dome super tweeter for clear, accurate highs. The tweeters employ a light-weight neodymium magnet for higher efficiency.

Marine Certified: Every DXi Series loudspeaker is designed not only to withstand the demands of a car's sun-baked climate, but corrosive marine environments too. That means subjecting them to ASTM (American Society for Testing and materials) scrutiny to ensure they are suitable for the marine environment. Each speaker is subjected to a series of grueling accelerated weathering tests to see if they can stand up to a harsh marine environment; including hundreds of hours of salt fog, intense ultra violet light and temperatures ranging from minus 40° C (-40° F) to +85° C (+185° F):

• Extreme Temp Test: cycles from -40°F to 185°F at 50% humidity for 48 hours
• Extreme Temp Test at High Humidity: cycles from -40°F to 185°F at 95% humidity for 24 hours
• Extreme Humidity Test: 140°F at 95% humidity for 54 hours
• Salt-Fog Materials Test: based on military specifications for ASTM D5894 and Mil-Std 883 tests: alternates one week of UV and one week of salt fog exposure, for six weeks (1008 hours total)
• UV/Salt-Fog Whole Speaker Test: based on military standard Mil-Std 883 Method 1009 8 test; UV and salt fog exposure, 24 hours