Room Correction

Room correction (also called room equalization) is the use of electronic signal processing to compensate for acoustic imperfections in a room’s frequency response at the listening position. Digital room correction systems measure the transfer function using a test microphone and apply inverse filters to the audio signal before it reaches the loudspeakers, flattening frequency response and reducing room mode impact. However, room correction has limitations: it only equalizes at specific positions (degrading elsewhere), cannot reduce reverberation time, and cannot add energy at deep modal nulls without excessive power. Room correction works best as a supplement to physical acoustic treatment, not a replacement. Popular systems include Dirac Live, Audyssey, and REW (Room EQ Wizard). Correction is most effective above the Schroeder frequency where modal control is less critical.