Polk Audio MM455, MM400, MM465 manual Polk Audio-A History of Excellence, Story of Dynamic Balance

Polk Audio—A History of Excellence

Like the way these great new speakers sound in your car? You’ll love the way Polk Audio speakers sound in your living room! Polk Audio has been making world-class loudspeakers since 1972. Polk’s dedication to fundamental research has resulted in over 25 patents.

Polk loudspeakers have earned the praise of audio experts the world over, garnering dozens of awards for innovative, high-quality design. Whether you desire audiophile-quality sound for your home, car or even your multimedia computer, Polk loudspeakers deliver unmatched performance and value.

See the full line of Polk Audio loudspeakers at your Polk Audio dealer, or at www.polkaudio.com

The Story of Dynamic Balance®

Your new Polk speakers employ Dynamic Balance, a technology that 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 that 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.

Concentric breakup of cone	Radial breakup of cone	Polk “Dynamic Balance”
produces distortion	produces distortion	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.

A M E R I C A N P O W E R , I T A L I A N F I N E S S E P O L K A U D I O / M O M O D E S I G N