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More commonly, commercial systems are employed to accomplish these tasks. Some systems distribute digital audio over Cat5 cable to amplifiers installed in each zone. Others have all equipment centralized and distribute speaker-level audio from the "headend" equipment location.
Multiple amplifiers can be combined together via transformers to yield higher voltage and higher current capacity lines. For instance, three 70-volt amplifiers have been used to make a 210-volt line by connecting them to a special-purpose external output transformer that has three primaries and a single secondary.
An audio distribution amplifier also known as: a press feed; a pool feed; a media feed; press box; or an ADA, takes a single audio feed, usually a line input, but it may be a microphone input, and outputs multiple line or microphone outputs. This can be done using a passive feed, where the signal is split among the outputs, or as an active feed ...
The first grounded bridge product released by Crown was the M600 amplifier (1974) primarily employed for commercial sound installations including constant voltage loudspeaker systems. [8] Crown received a patent for the invention in 1974. [9] After proving itself in the field, the topology was used to design the Microtech MT-1000 in 1984. [7]
The design of the distributed amplifiers was first formulated by William S. Percival in 1936. [1] In that year Percival proposed a design by which the transconductances of individual vacuum tubes could be added linearly without lumping their element capacitances at the input and output, thus arriving at a circuit that achieved a gain-bandwidth product greater than that of an individual tube.
The Yamaha PM5D-RH(remote head-amp) was all of the functionality of a PM5D in a 10 space rack that only required a PM5D-RH control surface. In 2007, Yamaha won a Technical Grammy for its NS-10 studio monitor , a speaker that dominated the mixing of pop and rock music throughout the world for at least 20 years. [ 6 ]
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