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Part-1 The History of...

Part - 1 The History of Audio Metering (4:43) From the beginning of electrical audio signals and the telephone industry's first meters through the broadcast and motion picture eras, the evolution of audio monitoring standards are presented in this interesting historical chronicle. Dorrough produces a variety of digital audio meters, video meters, surround sound meters, and audio and video test pro...

http://www.dorrough.com/part1.html

Dorrough

Changing Line Voltages on the 40-A2 The internal power supply of the 40-A2 Loudness Monitor contains a dual-primary power transformer that is normally shipped configured for 117VAC operation. To reconfigure the meter for 230VAC operation (or back to 117VAC), you will need to remove the meter from its enclosure. Locate the power transformer on the circuit board. Right next to the transformer are tw...

http://www.dorrough.com/volts.html

Dorrough

Multimedia New Movie Clips! Watch our Dorrough Loudness Monitor Demo and The History of Audio Metering movie clips. These QuickTime files work best with the latest version of QuickTimePlayer. Get QuickTime now. Part-1 The History of Audio Metering (4:43) From the beginning of electrical audio signals and the telephone industry's first meters through the broadcast and motion picture eras, the evolu...

http://www.dorrough.com/video.html

Western Electric 705A...

WE 705A The Western Electric 705A Speech Input Bay. Introduced in May of 1938, this bay assembly contained all the components required for program control at transmitter locations. It was also the first offering of popular 110A program amplifier in a preconfigured bay. Considered by many to be the "Grandaddy of limiters", the 110A was (in 1938) regarded as "the most significant innovation in broad...

http://www.dorrough.com/we705A.html

Dorrough

Dorrough Electronics designs and manufactures precision audio and video monitoring devices. For the past 20 years, Dorrough has pioneered new technologies in audio signal processing, and monitoring for the broadcast, motion picture, and recording industries. Although having developed and marketed the first Discriminate Audio Processor (DAP) in 1973 (shown at the right), the company is best known f...

http://www.dorrough.com/aboutus.html

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