Our Product Research Team
At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere.
That's because we have our own in-house Product Research team — they open the box,
verify contents, check the owner's manual, and record dimensions, features and specs.
We stay on top of new products and technologies to help people make informed choices.
Poly Cone: The DXi series subs use a durable polymer composite
cone. The cone is both lightweight and rigid, and will withstand the harsh automobile
Butyl Rubber Surround: The butyl rubber surround is resistant
to extremes in temperature, humidity, and exposure to sunlight for excellent long
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: 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.
Break-In Period: Subwoofers will achieve optimal performance
once they are thoroughly broken-in. To break in a new DXi sub play music through
it for 20 to 30 hours at moderate levels.
Sealed Box Volume: Polk recommends mounting this woofer in a
sealed enclosure with an internal volume of 0.66 cubic feet.
Ported Box Volume: Polk recommends a ported enclosure with
an internal volume of 1.25 cubic feet using a 4" diameter x 12" long
Bandpass Box Volume: Polk recommends a bandpass enclosure
with a 0.80 cubic foot sealed rear chamber and a 0.85 cubic foot ported front
chamber with 4" diameter x 9" long port.