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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Assuming you are indoors, these are called room modes.
Bass has a long wavelength relative to the woofer diameter, this leads to the bass being essentially omnidirectional. Since it’s radiating in all directions, it thus bounces (reflects) off all the walls/surfaces. These reflections will naturally interact with other reflections, and these waveforms all have different timing. The relative difference will cause an increase/decrease in loudness depends on how they align.
These room modes differ at location, so the sound changes per location in the room.
To combat this, you need to add more subwoofers. More subwoofers cause even more interference, it becomes so chaotic that it actually averages out to be neutral and consistent.
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