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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.
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 ...
A rotary woofer is a subwoofer-style loudspeaker which reproduces very-low-frequency content by using a conventional speaker voice coil's motion to change the pitch (angle) of the blades of an impeller rotating at a constant speed. The pitch of the fan blades is controlled by the audio signal presented to the voice coil, and is able to swing ...
After moving to its current 107.9 frequency, WSRZ-FM was then renamed as "Oldies 108". In early 2007, the moniker was changed to the present "107.9 WSRZ", dropping music from the 1950s and 60s. The current format is classic hits , focusing on music from the 1970s and 80s, with some 90s hits.
The aircraft could be fitted with wheel, float or ski landing gear. The single 108-4 built was a Flying Station Wagon. [citation needed] 108-5 A single 108-5 was built by Univair, who purchased the Stinson 108 type certificate from Piper, in 1964. The 108-5 used a 180 hp (134 kW) Franklin 6A-335-B1 engine.
FMVSS 108 is codified in Title 49 of the Code of Federal Regulations Part 571, Section 108. [1] The most recent version was published by NHTSA for comment in December 2007, [2] and since then, it has been amended in April 2011, [3] August 2011, [4] January 2012, [5] December 2012, [6] December 2015, [7] February 2016, [8] and February 2022.
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