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Polk Audio was founded by Matthew Polk, George Klopfer and Sandy Gross in 1972. The three first met one another while attending classes at Johns Hopkins University in Baltimore . After graduating in 1971, the team collaborated on producing a sound system for a local bluegrass music convention.
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In 2004, the firm bought speaker company Definitive Technology; [3] in 2006, it bought Polk Audio. [4] In 2008, the companies adapted a holding company strategy, and their parent became DEI Holdings, Inc. [5] In 2011, the company was bought by private equity firm Charlesbank Capital Partners. [6]
Diagram showing the variation in impedance of a typical mid-range loudspeaker. Nominal impedance is usually determined at the lowest point after resonance. However, it is possible for the low-frequency impedance to be still lower than this. [1]
In April 2013, the company combined Polk, Definitive Technology and the Boom Movement brands into a new division called Sound United. [ 7 ] In April 2015, the company released its W7 speaker with support for the Play-Fi wireless protocol for multi-room audio, produced by audio company DTS, Inc. , now owned by holding company Xperi . [ 1 ]
Advantages of electrostatic loudspeakers include: the very low mass of the diaphragm, which is driven across its whole surface; exemplary frequency response (both in amplitude and phase) [citation needed] because the principle of generating force and pressure is almost free from resonances unlike the more common electrodynamic driver.
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