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The 1925 paper [1] of Chester W. Rice and Edward W. Kellogg, fueled by advances in radio and electronics, increased interest in direct radiator loudspeakers. In 1930, A. J. Thuras of Bell Labs patented (US Patent No. 1869178) his "Sound Translating Device" (essentially a vented box) which was evidence of the interest in many types of enclosure design at the time.
Orion; Panasonic (a brand of Matsushita Electric Industrial Co.) (manufacturers Fender and ELS sound systems for Volkswagen and Acura vehicles) Parrot Automotive; Pioneer (also an OEM option for many GM, Ford, Mazda pickup trucks, Toyota/Lexus and Honda vehicles) Pride Car Audio; Polk Audio; Rainbow-Audio Germen Engineering; Sanyo; Sony
From about 1900 to the 1950s, the "lowest frequency in practical use" in recordings, broadcasting and music playback was 100 Hz. [9] When sound was developed for motion pictures, the basic RCA sound system was a single 8-inch (20 cm) speaker mounted in straight horn, an approach which was deemed unsatisfactory by Hollywood decisionmakers, who hired Western Electric engineers to develop a ...
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 ...
Loudspeaker enclosures range in size from small "bookshelf" speaker cabinets with 4-inch (10 cm) woofers and small tweeters designed for listening to music with a hi-fi system in a private home to huge, heavy subwoofer enclosures with multiple 18-inch (46 cm) or even 21-inch (53 cm) speakers in huge enclosures which are designed for use in ...
The primary applications of this conductor revolve around weight reduction requirements. These applications include high-quality coils, such as the voice coils in headphones or portable loudspeakers; high frequency coaxial applications, such as RF antennas and cable television distribution cables; and power cables.
Data from manufacturer and FAA General characteristics Crew: one Capacity: four passengers Length: 23.67 ft (7.21 m) Wingspan: 32.92 ft (10.03 m) Height: 6.33 ft (1.93 m) Empty weight: 1,549 lb (703 kg) typical, equipped Gross weight: 2,500 lb (1,134 kg) Fuel capacity: 40 U.S. gallons (150 L; 33 imp gal) usable (standard) Powerplant: 1 × Lycoming O-540-J1A5D six cylinder, horizontally-opposed ...
The Lockheed P-3 Orion is a four-engined, turboprop anti-submarine and maritime surveillance aircraft developed for the United States Navy and introduced in the 1960s. Lockheed based it on the L-188 Electra commercial airliner; it is easily distinguished from the Electra by its distinctive tail stinger or "MAD" boom, used for the magnetic anomaly detection (MAD) of submarines.