Room Acoustics Software
REW is room acoustics analysis software for measuring and analysing room and loudspeaker responses. It includes tools for generating audio test signals; measuring SPL and impedance; measuring frequency and impulse responses; 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. 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.
- Frequency response measured using logarithmically swept sine signals for fast, accurate room acoustics and audio analysis measurements using either an SPL meter or measurement microphone
- Real Time Analyser with up to 1/48th octave resolution
- Spectral decay plots, waterfalls and spectrograms
- Impulse response, step response and energy-time curves
- Reverberation times derived in accordance with ISO 3382 in octave or one-third octave bands with results for Early Decay time (EDT), T20, T30 and an optimal fit RT60 figure, impulse response can be displayed with octave or one-third octave filter applied
- Signal Generator offering sine waves, square waves, linear and logarithmic sine sweeps, random pink noise (full range, speaker calibration, sub calibration and custom filtered) and periodic pink and white noise
- Sound level meter with full integrating functionality including equivalent sound level and sound exposure level; mic/meter and soundcard calibration corrections applied; A, C or Z weighting
- Phase & Group Delay (measured, minimum and excess)
- Phase wrap/unwrap, minimum phase generation
- Impedance measurement and Thiele-Small parameter calculation
- Impulse Response delay calculation and adjustment
- Measurement arithmetic functions, add/subtract/multiply/divide/merge measurement
- Automatic identification of peaks in the response, automatic assignment of EQ filters to peaks and optimisation of filter parameters to counter the peaks and track a desired target response
- Waterfalls of predicted results of EQ can be viewed in the EQ panel and can update live as filter settings are adjusted
- Support for the Behringer Feedback Destroyer Pro models DSP1124P and FBQ2496, including filter setup via Midi (Midi interface required)
- Support for QSC DSP-30, Crown USM 810, Behringer DCX2496 and MiniDSP parametric filters
- Room resonance analysis to determine the frequencies and decay times of modal resonances with pole-zero plots of the response and any filters applied
- "Modal" filter setting provided for parametric EQ filters to aid in correcting modal decay
- Frequency response import from and export to text files
- Impulse response import from WAV or AIFF files
- Export impulse responses of measurement or filter settings to WAV files with 16, 24 or 32-bit resolution
- Compensation for C-weighting when using an external SPL meter as the input, calibration files can be loaded for soundcard, microphone or SPL meter
- Comprehensive help files within the application and on-line
- REW requires V5.0 or later of the Java Runtime Environment, available from http://www.java.com for Windows and Linux platforms.
- REW has been written and tested under Windows XP, Windows 7 and Windows 8, most features should work correctly on other platforms that support Oracle's Java Runtime Environment, except for RS232 serial communications (only used to communicate with TAG McLaren Audio AV32R DP and AV192R AV Processors) which only function on Windows platforms. It has also been tested under Windows Vista and Mac OS X 10.4 & 10.5 (OS X 10.5 Leopard or later recommended).
- Midi communication (used to set filters on Behringer BFD Pro DSP1124P and FBQ2496 equalisers) is supported on Windows platforms. Linux platforms will require Tritonus to support Midi comms. Mac OS X platforms with J2SE V5.0 or later installed should support Midi but don't appear to.
- Minimum screen resolution: 800 x 600, 1024 x 768 or greater recommended
- Minimum RAM: 512MB, 2GB or more recommended
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 V5.00, released 30th January 2011, the latest updates (including USB mic support and ASIO support on Windows) are in the V5.01 beta releases. To view the revision history of REW click here.
- REW V5.01 beta releases for USB mic support and the latest features and fixes
- REW for Windows current version at Home Theater shack
- REW application bundle (zipped) for Mac OS X at Home Theater shack
- REW jar files (zipped) for Linux platforms at Home Theater shack
- Sampledata.mdat, some sample measurement data including impedance measurements
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
The REW room acoustics software contains comprehensive help information. You can also view the help files online, download the html files for offline viewing or download a PDF copy. For additional tips and assistance in using the software visit the Home Theater Shack REW forum.
- Official REW Forum for Home Theater Enthusiasts
- Thread on REW setup with USB mics and HDMI on AVS Forum
- BFD Guide
- Convolver plug-in
- Equalizer APO system-wide parametric equalizer for Windows 7 / 8 / 8.1
- Gearslutz Studio Building / Acoustics forum
- Texas Instruments Audio Characterization Primer using REW