What is destructive inference and constructive inference?
Constructive inference: Whenever two waves collide in a quiet manner that respective crests line up, this is referred to as constructive interference. The resultant wave is larger in amplitude.
Example: If somehow the speakers would be in a similar location, constructive interference would occur at all places directly next to the loudspeaker.
Destructive inference: The peak of one wave hits the trough of another in destructive interference, resulting in a decreased overall amplitude.
Example: Destructive interference occurs whenever the speakers have been separated approximately half a wavelength.