4
Premium Performance Loudspeakers
Premium Performance Loudspeakers
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dX
Series
dX
Series
The Story of Dynamic Balance
®
Your new Polk speakers employ Dynamic Balance, a technology which came out of a joint
research project between Polk Audio and Johns Hopkins University. This laser imaging
research enables us to view the entire vibrating surface of a driver or tweeter, allowing us to
observe the resonances which develop on speaker cones as they move. These resonances are
the root cause of frequency response distortions.
As an x-ray enables a physician to discover the root cause of a symptom and thereby pre-
scribe the right treatment for a cure, this laser imaging technique allows Polk engineers to
find the right combination of high-tech materials, geometry and construction techniques to
tune out the offending resonances. The benefit of Dynamic Balance is the dramatic
improvement in the sound quality of our speakers, which every listener can appreciate. You
no longer have to choose between excellent bass and smooth, clear midrange and highs.
Now you can have it all, thanks to Dynamic Balance technology.
A Word From Matthew Polk
Dear Music Lover,
Thank you for purchasing Polk Audio speakers.
Designing and building speakers is more than just a
business for the people of Polk Audio – it is our passion.
We are all dedicated to your complete satisfaction and
delight.
Your new Polk speakers include the latest loudspeaker
technology to assure outstanding performance and
unmatched quality. Please take a moment to read
through this manual for information on getting the
greatest enjoyment from these fine instruments.
We make a wide variety of automotive loudspeakers, including factory replacements, coaxes,
component systems, tweeters and subwoofers. If you would like more information on building
the Polk car system of your dreams, consult your Polk Audio dealer or call our Customer Service
Department at 1-800-377-7655 from 9am to 6pm, Eastern Time, Monday through Friday or
contact us via our World Web Site at http://www.polkaudio.com.
Sincerely,
Matthew S. Polk
Concentric breakup of cone
produces distortion
Radial breakup of cone
produces distortion
Polk “Dynamic Balance”
design results in
low distortion
Laser Interferometry tests produced holographic “photos” of drivers
in motion. The “bad” drivers are experiencing modal breakup that
results in performance-robbing resonances. A “perfect” driver would
look like a cake (flat on top), more, like the photo on the right.
