Room Acoustics Software

REW is free 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.

Downloads

The current version is V5.18, 4th January 2017. To view the REW revision history click here.
Windows files replaced 5th January, download again if having problems using ASIO
OS Downloads
Windows
XP/Vista/7/8/10
Windows installer with JRE (30.5MB, includes private Java 8 runtime)
Recommended for most users unless running Windows XP

Windows installer (15.1MB, requires separate Java 7 or 8 installation)
Recommended for Windows XP or if Java 7 or 8 is already installed

Windows installer with JRE allowing multiple instances (30.5MB)
Allows multiple REW instances to run at the same time
OS X
10.7 - 10.12
OS X DMG (31.7MB, includes private Java 8 JRE)
Linux Linux installer (12.9MB, requires Java 7 or 8)
The Oracle Java runtime seems to work best
All Sampledata.mdat (8.0MB)
Sample measurement data

Donations

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, download the html files for offline viewing (6.7MB) or download a PDF copy (9.3MB, courtesy of Steve Bolser). For additional tips and assistance in using the software visit the Home Theater Shack REW forum.

Links

Measurement Equipment

The simplest configuration for most acoustic measurement purposes is a calibrated USB microphone (miniDSP's UMIK-1 is recommended) and your computer's headphone or HDMI output. An analog measurement microphone (Dayton Audio's EMM-6, for example) will need a suitable interface with a mic preamp and phantom power, such as Steinberg's UR22 MkII or the Focusrite Scarlett Solo.

miniDSP UMIK-1 calibrated USB measurement microphone
US link
miniDSP.com (Hong Kong)
miniDSP dealers
Dayton Audio EMM-6 calibrated analog measurement microphone
US link
UK link
DE link
FR link
Steinberg UR22 MkII USB audio interface
US link
UK link
DE link
FR link
Focusrite Scarlett Solo USB audio interface
US link
UK link
DE link
FR link

Recommended Reading

Master Handbook of Acoustics, Sixth Edition
US link
UK link
DE link
FR link
Sound Reproduction: The Acoustics and Psychoacoustics of Loudspeakers and Rooms
US link
UK link
DE link
FR link
Home Recording Studio: Build It Like the Pros
US link
UK link
DE link
FR link

Reference Material

John Mulcahy is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com.