Acoustic treatment

Acoustic treatment refers to materials placed inside a room, typically foam or fabric-wrapped panels, that absorb sound waves after they leave the microphone's pickup area and bounce off hard surfaces like walls, windows and desks. The goal is reducing echo and reflections so a recording sounds clean and close rather than distant and boomy.

This is a different problem from soundproofing, which is about blocking sound from entering or leaving a room, usually through mass, sealed gaps and decoupled construction. A room can be heavily soundproofed and still sound terrible to record in in if it has no acoustic treatment, and a lightly treated room can sound great even without soundproofing.

Treating the first reflection points, the spots on the walls and ceiling where sound from the mic position would bounce straight back, gives the most noticeable improvement per panel. Simple additions like a rug, curtains, a bookshelf or a couch also help, which is why acoustic treatment does not have to mean a fully professional-looking studio to be effective.