Room Acoustics Software

REW is room acoustics analysis software for measuring and analysing room and loudspeaker responses. The audio analysis features of REW help you optimise the acoustics of your listening room, studio or home theater and find the best locations for your speakers, subwoofers and listening position. It includes tools for generating audio test signals; measuring SPL and impedance; measuring frequency and impulse responses; measuring distortion; generating phase, group delay and spectral decay plots, waterfalls, spectrograms and energy-time curves; generating real time analyser (RTA) plots; calculating reverberation times; calculating Thiele-Small parameters; determining the frequencies and decay times of modal resonances; displaying equaliser responses and automatically adjusting the settings of parametric equalisers to counter the effects of room modes and adjust responses to match a target curve.



REW requires Java 7 or later available from for Windows and Linux platforms. REW supports OS X 10.7.3 or later with its own embedded Java Runtime Environment (Java does not need to be installed).


Use of REW is subject to the terms of the End User License Agreement

You must register and login to the Home Theater Shack forums to download the most current REW files. Registration is free (though convoluted) and all downloads are free.

The current version is V5.10, released 14th February 2015. To view the revision history of REW click here.


If you find REW useful you can make a donation by clicking the button below. Many thanks to those who have already donated, your generosity keeps REW development going and is greatly appreciated.

Help Files

The REW room acoustics software contains comprehensive help information. You can also view the help files online (V5.1 online help, V5.0 online help), download the html files for offline viewing (V5.1 html files, V5.0 html files) or download a PDF copy (V5.0 help PDF, V5.1 help PDF, courtesy of Steve Bolser). For additional tips and assistance in using the software visit the Home Theater Shack REW forum.


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