Скачать или смотреть What Are Room Modes? Finally A Simple Explanation

Technically, you still have room modes in very small rooms, but they are high enough in frequency that standard absorption (acoustic panels or velocity traps) will effectively treat them. The lower in frequency the modes, the harder they are to treat. Most normal rooms will have room modes - resonances - that have a major impact of how things sound.
The best way to treat these low frequency modes is with a targeted approach, like Helmholtz absorbers or diaphragmatic (limp mass) absorbers, But those are difficult to build correctly (to hit the right frequency), take up a lot of space and need to be located correctly in the room.
The way I did my room was to add as much standard absorption as I could, plus I experimented with the wall panels to act as a broader-band diaphragmatic absorber.
My approach was to chip away at those resonances to try to bring it down to the point where it's no longer as much of a problem.

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