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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 ...
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 ...
Size comparison of common World War II submarines with the Typhoon class Soviet Typhoon-class ballistic missile submarine, with inset of an American football field graphic to convey a sense of the enormous size of the vessel. The Typhoon class was developed under Project 941 as the Soviet Akula class (Акула), meaning shark.
Condensed World Paramilitary Forces 2006 (PDF) (Report). Archived from the original (PDF) on March 27, 2009. "SIPRI Military Expenditure Database". Stockholm International Peace Research Institute. South African Navy official website
Scientists in China have built the world’s most powerful magnet, capable of producing a magnetic field 800,000 stronger than Earth’s. After four years of development, a team from the Chinese ...
As the world’s most powerful towboat engine, this powertrain comes standard on both 23- and 25-foot models, providing unparalleled performance both behind the wheel and on the water. Whether cruising across the lake or towing riders, the supercharged Ilmor engine ensures exceptional responsiveness and smooth acceleration.