Hey, I'm taking an audio class and I'm on a homework question I can't seem to remember the answer (even though it seems to be a pretty easy question). "If you cause phase cancellation at 1000hz, you experience cancellation at 2000hz, 4000hz, and 8000hz. What is this kind of phase cancellation called?" Could anyone tell me what this is? I know the overtones of a sound are multiples of the fundamental frequency (200Hz fundamental frequency, 400Hz, and 600Hz harmonics), which is kind of like the 1000Hz, 2000Hz, 4000Hz, etc.