we want that no noise comes out of our boss room
Answers:
1Foam, lots of thick foam. In addition, foam in the shape of cones, and you'll like this, cone shape must have the points pointed inward to the center of the room.
These foam panels are attached to the walls and ceiling.
Professional sound pressure level measurements are made on equipment which are inside such a room. If you are in one of these rooms, it is so dead quiet, that you can hear your heart beat.
Or, take the instruments away!
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