As per Wikipedia [0], The Acoustics Department at University of Salford has a number of Anechoic chambers, of which one is unofficially the quietest in the worl

As per Wikipedia [0], The Acoustics Department at University of Salford has a number of Anechoic chambers, of which one is unofficially the quietest in the world with a measurement of −12.4 dBA. [0] http://en.wikipedia.org/wiki/Anechoic_chamber http://en.wikipedia.org/wiki/Anechoic_chamber