roomcorrection

Room correction, in audio engineering, refers to a set of measurement-based digital signal processing techniques intended to compensate for the influence of a listening environment on sound reproduction. The aim is to flatten the overall frequency response and improve spatial accuracy by applying corrective filters to loudspeakers, subwoofers, or headphones, typically within a playback system or software.

Common approaches combine acoustic measurements with digital filtering. Measurements of the room's impulse response, using a calibrated microphone at the listening position, feed software that designs equalization filters (often FIR or IIR) and may include time-domain adjustments or bass management. Some systems also attempt to correct for speaker-to-room delays and modal behavior. Room correction is distinct from physical room treatment; it is a complement, not a substitute, for proper speaker placement and acoustic treatment.

Measurement process: position the microphone at or near the listening position, play test signals (sine sweeps, MLS, pink noise), capture responses, and derive a target response. Results are applied in real time or as precomputed filters. Reassessment after changes to seating, furniture, or devices is recommended. Limitations include dependence on measurement accuracy, nonuniform room modes, and the potential for introducing phase shifts or transient smearing if over-applied.

Applications and considerations: widely available in AV receivers, gaming and music software, and standalone room-correction products. Benefits can include a smoother bass, reduced room-induced peaks, and improved imaging, but may also lead to artificial sound if used inappropriately. Best practice combines moderate correction with proper room treatment and careful speaker positioning.