Room EQ Wizard

About this resource

Room EQ Wizard, or REW, is software for measuring and analysing audio systems and room acoustics on Windows, macOS and Linux. It is copyrighted and licensed by John Mulcahy, with the core application available without charge for personal, educational and commercial use under its licence terms. The project accepts donations and offers a separate Pro upgrade with additional measurement capabilities. ^{[1] [3] [2]}

Its main value is turning listening-room problems into measurements you can inspect. REW generates test signals and displays frequency and impulse responses, waterfalls, spectrograms and other views of how sound changes with frequency and time. It can also calculate parametric EQ settings to bring a measured response closer to a chosen target. ^{[1] [3]}

For home listeners, the official site suggests using it to investigate speaker and subwoofer placement, listening position and room-related problems. A calibrated USB measurement microphone is the simplest suggested setup for most acoustic measurements; an analogue microphone requires a suitable interface. Start with the setup guidance and help files before interpreting graphs or applying correction. REW is best understood as a measurement and analysis tool: its results guide placement changes, room treatment and EQ implemented in compatible hardware or software, rather than serving as an automatic room-correction system on its own. ^{[1] [3]}