Reflected Sound   

Sound which reaches the listener's ears after being reflected off of one or more surfaces. The relationship of reflected sound with direct sound is used by the brain as cues to provide us with a sense of the direction from which a sound comes and also the type of acoustic spacethe sound occurs in. 
The diagram above represents a theoretical two dimensional space with reflective surfaces. Two rays of sound are shown emanating from the sound source and the first four reflections. In a real-world acoustic space ofthree dimensions and a complex shape the number of paths taken by the sound would be extremely numerous and complex, resulting in the phenomena known as reverberation. 

precedence (Haas) effect (initial sound supresses those not louder following for about 40 milliseconds).