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2. Polk Audio - Wikipedia

   en.wikipedia.org/wiki/Polk_Audio

   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.

3. List of car audio manufacturers and brands - Wikipedia

   en.wikipedia.org/wiki/List_of_car_audio...

   This list of car audio manufacturers and brands comprises brand labels and manufacturers of both original equipment manufacturer (OEM) and after-market products generally related to in-car entertainment that already have articles within Wikipedia. While components sold by these companies have much in common with other audio applications or may ...

4. List of loudspeaker manufacturers - Wikipedia

   en.wikipedia.org/wiki/List_of_loudspeaker...

   PMC speakers: United Kingdom Polk Audio: United States ProAc: United Kingdom PSB Speakers: Canada QSC Audio Products: United States Quad Electroacoustics: United Kingdom (brand) Radio Shack: United States RCF audio: Italy Rectilinear Research Corporation: United States Rega Research: United Kingdom Renkus-Heinz: United States ReVox: Switzerland ...

5. DEI Holdings - Wikipedia

   en.wikipedia.org/wiki/DEI_Holdings

   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 ]

6. Subwoofer - Wikipedia

   en.wikipedia.org/wiki/Subwoofer

   The rear panel of a Polk subwoofer cabinet, showing a low-pass filter adjustment knob. Equalization can be used to adjust the in-room response of a subwoofer system. [58] Designers of active subwoofers sometimes include a degree of corrective equalization to compensate for known performance issues (e.g. a steeper than desired low end roll-off ...

7. Definitive Technology - Wikipedia

   en.wikipedia.org/wiki/Definitive_Technology

   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 ]