Space crafts are tested with concert speaker. It is a direct field acoustical testing. Basically one of the loudest sound systems in the world blasts the object to see what vibrates loose. : iPhone stumm schalten lautlos stellen auch ohne Schalter The Sounds of Spacetime American Scientist Cosmic Sound Comparison What Would Space Sound Like?! Space is silent to human ears but the universe still creates powerful vibrations and signals. The Sun giant iPhone Vibration einstellen oder ausschalten so geht's Macwelt Satellite Vibration Testing at UTS Tech Lab: Space Machines Company