Why does a low frequency wave from a speaker or subwoofer felt and sounded different when you slightly move your position?
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You could be experiencing interference between two sources of the sound: either two speakers, or directly from a speaker and a reflection off a nearby surface.
At one point the two sources are constructively interfering (loud), and when you move a bit, you find a spot of destructive interference (quiet).
The reason you might notice this more with low frequencies is that the distances between constructive and destructive spots are farther apart, probably on the order of a few centimeters or more. So when moving around slightly, you notice the increase and decrease in amplitude.
High frequencies do the same thing, but the distances between the interference points are much smaller. You probably wouldn’t notice the change by just moving your head around since the distances are likely smaller than your ear.
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