Ko te hokinga o te oro e puta ana i tētahi tukuoro ki te hopuoro i kapohia ai taua oro i te tuatahi. Ka haere tuarua te oro mā roto anō i te whākaha oro. Ko te tioro te hua.
The return of the sound coming out of the loudspeaker to the microphone which captured the sound in the first instance. The recaptured sound is then carried through the amplifier for a second time. A loud screeching noise is the result.