Microsoft無響室細節

http://www.bbc.com/future/story/20170526-inside-the-quietest-place-on-earth?utm_content=buffer68018&utm_medium=social&utm_source=facebook.com&utm_campaign=buffer

The chamber sits at the heart of six concrete onion layers that help to block out sounds from the outside world. This nest of rooms within rooms – each with walls up to 12 inches thick – helps to cut the noise reaching the chamber by around 110 decibels. If a jet was taking off just outside the building, you would hear little more than a whisper inside the final concrete bunker where the chamber is.
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The chamber itself floats on top of 68 vibration damping springs mounted on its own separate foundation slab.
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The anechoic chamber is a cube measuring 21ft (6.36m) in each direction. Each of its six surfaces is lined with clusters of 4ft-long (1.2m) wedges of sound absorbing foam, helping to prevent any echoes bouncing off the walls from any sound produced inside. A floor made from steel cables – the same kind used to stop fighter jets as they land on aircraft carriers – are knitted together like a trampoline net above the foam wedges on the bottom of the chamber. 

吸音材深度1.2m
沒有地板，而是鋼索構成的金屬網，
那位要在家裡仿造？