Photo: #Steve Orfield, founder and president of Orfield Laboratories.
Photo: #The building that is now the home to Orfield Labs was once the site of Sound 80 Studio where Minnesota native Bob Dylan recorded "Blood on the Tracks."
Photo: #Head and torso simulator used to measure how sound is perceived by the human ear.
Photo: #The reverberation room, along with the anechoic chamber, is one of the two main research rooms at Orfield Labs. Unlike the anechoic chamber, which absorbs sound, the reverb room reflects it.
Photo: #Sound-absorbing technology prevents external sounds from entering the anechoic chamber at Orfield Laboratories. These rooms are so quiet that according to Orfield, "if we let you sit in here for half an hour, you'd start to hear your heartbeat, you'd start to hear your lungs flow."
Photo: #Fiberglass and metal wedges surround the walls of the anechoic chamber at Orfield Labs.
Photo: #The floor of the anechoic chamber is 30 feet deep and filled with more fiberglass and metal wedges.
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Sound-absorbing technology prevents external sounds from entering the anechoic chamber at Orfield Laboratories. These rooms are so quiet that according to Orfield, "if we let you sit in here for half an hour, you'd start to hear your heartbeat, you'd start to hear your lungs flow." (MPR Photo/Orfield Labs)
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The quietest place on earth

by Cathy Wurzer, Minnesota Public Radio
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St. Paul, Minn. — Minnesota has received a lot of attention lately for nationally acclaimed buildings like the new Guthrie Theater, the new Minneapolis Public Library, and the Walker Art Center. One building in Minneapolis has even made the Guinness Book of World Records -- twice.

The building was first put on the map as Sound 80 Studio, where Bob Dylan recorded "Blood on the Tracks." This year, Guinness labeled it as having the "world's first digital recording studio." In 2005, Guinness called one of its rooms the "quietest place on earth."

MPR's Cathy Wurzer took a tour of this building with Steve Orfield, founder and president of Orfield Labs. He talked about his psychoacoustic research, which examines how people perceive sounds. The research involves such noise-generating products as motorcycles, dishwashers and artificial heart valves.

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