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Dumble, however, was not interested in selling amplifiers in greater numbers, but focused solely on getting the best possible sound. Building to order only (even building his own speaker cabinets by hand), his amps gained a positive reputation and became highly sought after by professional musicians. Dumble became known as a tube electronics ...
It consisted of 22 five-inch drivers and was designed to be located in the corner of a room, using reflections off the walls and floor to disperse the sound. [21] The system included tone controls and a switch to attenuate frequencies below 50 Hz. [22] [23] [24] The 2201 was a market failure and Bose discontinued it after three or four years. [25]
Further development led to the JCM800 series in 1981, which was widely adopted by the hard rock and metal community, while the brand celebrated its 25 years of making amps by releasing the Silver Jubiliee in 1987. Marshall updated the JCM lineup in the 1990s (JCM900) and 2000s (JCM2000) and developed new amp lines, like the DSL and JVM models.
For architects, the increased versatility and space savings because of the smaller cross-section of SPWs, compared to reinforced concrete shear walls, is a distinct benefit, especially in high-rise buildings, where reinforced concrete shear walls in lower floors become very thick and occupy a large proportion of the floor plan.
Intermediate metal conduit (IMC) is a steel tubing heavier than EMT but lighter than RMC. It may be threaded. Electrical metallic tubing (EMT), sometimes called thin-wall, is commonly used instead of galvanized rigid conduit (GRC), as it is less costly and lighter than GRC. EMT itself is not threaded, but can be used with threaded fittings that ...
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