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branwen
Bass waves move around the walls like water across a surface, they pile up in corners, especially in corners with floors. I have a pretty neutral listening position but there's an extra 6db of bass in the corner of the room behind the listening position. Room modes are often caused by the room length combining with a particular wavelength (50hz is 6.84m) so it reflects on the back wall and returns to mess with the outgoing wave adding and subtracting depending on the length of the room. This is why 50hz bumps are so predictable and difficult to cure in London sized rooms.
In short to answer your question, it doesn't improve the rest of the room much. High frequency reflection attenuation tends to improve the whole room but you are probably only going to get a small sweet spot overall, especially in a small room.