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The Rectilinear speakers were typically, but not always, of ported design and finished in walnut with fabric or fretwork grilles. Many models featured one, or sometimes two, rear tone controls. The company offered some of their models as kits and "semi-kits". [23] Later models (1971 - approx. 1977) include: [24] 2; 4; 4.5; 5
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 midwoofer-tweeter-midwoofer loudspeaker configuration (called MTM, for short) was a design arrangement from the late 1960s that suffered from serious lobing issues that prevented its popularity until it was perfected by Joseph D'Appolito as a way of correcting the inherent lobe tilting of a typical mid-tweeter (MT) configuration, at the crossover frequency, unless time-aligned. [1]
The most significant change from Challenger 2 to Challenger 3 is the replacement of the Challenger's main armament from a 120 mm L30A1 rifled main gun to the 120 mm L55A1 [18] smoothbore gun (which itself is an upgraded version of the L55 fitted to the Leopard 2A6/A7 family of main battle tanks) giving commonality with other NATO members ...
In 1975 Ed Long [1] in cooperation with Ronald J. Wickersham invented the first technique to Time-Align a loudspeaker systems. In 1976 Long presented "A Time-Align Technique for Loudspeakers System Design" [2] at the 54th AES convention demonstrating the use of the Time-Align generator to design improved crossover networks for multi-way loudspeakers systems.
Partisans of full-range loudspeakers claim superior phase coherence, while some critics describe them as midrange speakers working at or beyond their limits. Some full range drivers have been developed using 12" and 15" drivers, e.g. Audio Nirvana, and have overcome the bass limitations of smaller drivers using bass reflex cabinets.
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