REW

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

OS	Downloads
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
10.7 - 10.13	OS X DMG (31.7MB, includes private Java 8 JRE)
	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). Online help for the current beta version can be found in the Beta help files. For additional tips and assistance in using the software visit the AV NIRVANA REW forum.

Links

• Official REW Forum at AV NIRVANA
• Thread on REW setup with USB mics and HDMI on AVS Forum
• REW Wiki in Deutsch geschrieben
• REW help tradotta in Italiano
• Gearslutz Studio Building / Acoustics forum
• Equalizer APO system-wide parametric equalizer for Windows 7 / 8 / 8.1 / 10
• Convolver plug-in
• Texas Instruments Audio Characterization Primer using REW
• miniDSP acoustic measurement application notes
• REW uses the install4j multi-platform installer builder

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
	Dayton Audio EMM-6 calibrated analog measurement microphone
	Steinberg UR22 MkII USB audio interface
	Focusrite Scarlett Solo USB audio interface
	miniDSP 2x4 HD DSP / Equaliser / USB DAC / crossover miniDSP.com (Hong Kong)

Recommended Reading

	Master Handbook of Acoustics, Sixth Edition
	Sound Reproduction: The Acoustics and Psychoacoustics of Loudspeakers and Rooms, Third Edition
	Home Recording Studio: Build It Like the Pros