Wayne Parham Messages: 18783 Registered: January 2001
Illuminati (33rd Degree)
Outdoors is anechoic. "Anechoic" means echo free. An anechoic chamber is a room specially designed to absorb sound rather than reflect it. It is usually only anechoic down to a few hundred Hertz, below which it is modal and not anechoic. A wide open area outdoors is truly anechoic, even at the lowest frequencies.