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Room Acoustics SoftwareREW 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.DownloadsThe current version is V5.19, revised 27th August 2018. To view the REW revision history click here.OS: WindowsXP/Vista/7/8/10 Windows installer with JRE (32.8MB, includes private Java 8 runtime)Recommended for most users unless running Windows XPWindows 64-bit installer (16.5MB, requires separate 64-bit Java 7 or 8 installation)Recommended for Windows 10 if 64-bit Java 7 or 8 is already installedWindows installer (16.4MB, requires separate 32-bit Java 7 or 8 installation)Recommended for Windows XP or if 32-bit Java 7 or 8 is already installedWindows installer with JRE allowing multiple instances (32.8MB)Allows multiple REW instances to run at the same timeOS XIntel-based10.8.3 - 10.13 macOS DMG (35.3MB, includes private Java 8 JRE)BetterTouchTool, Moom and Magnet Window Manager are not compatibile with the installer, disable them while installing REW. For 10.14 Mojave use the latest V5.20 beta version from AV NirvanaLinux Linux installer (15.6MB, requires Java 7 or 8 ) The Oracle Java runtime seems to work bestAll Sampledata.mdat (8.0MB)Sample measurement dataDonationsIf you find REW useful you can make a donation by clicking the button. Many thanks to those who have already donated, your generosity keeps REW development going and is greatly appreciated.Help FilesThe REW room acoustics software contains comprehensive help information. You can also view the help files online, download the html files for offline viewing (8.9MB) or download a PDF copy (11.8MB, 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. Features in detail: Free!Frequency response and distortion measurement using logarithmically swept sine signals for fast, accurate analysis of room acoustics and audio performanceMeasure using an SPL meter, USB measurement microphone or analog measurement microphoneOptions to use a loopback connection or another speaker as a timing referenceOffline measurement mode allowing responses to be generated from imported sweep recordingsFrequency response and distortion measurement using stepped sine at up to 96 points per octaveReal Time Analyzer with up to 1/48th octave resolutionSignal Generator offering: sine waves (optionally including harmonics with level and phase control)Square wavesDual tone signalsTone burstsCEA-2010 tone burstsLinear and logarithmic sine sweepsRandom pink noise (full range, speaker calibration, sub calibration and custom filtered)Periodic pink and white noise (full range, speaker calibration, sub calibration and custom filtered)Export of signals to WAV files 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 weightingSpectral decay plots, waterfalls and spectrograms (Fourier and wavelet)Impulse response, step response and energy-time curvesReverberation 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 figureClarity and definition parameters C50, C80 and D50 plus centre time TsImpulse response can be displayed with octave or one-third octave filters appliedFrequency-dependent windowing of impulse responseHarmonic and intermodulation distortion measurement including harmonic phasePhase & Group Delay (measured, minimum and excess)Phase wrap/unwrapMinimum phase response generationImpedance measurement and Thiele-Small parameter calculationImpulse Response delay calculation and adjustmentMeasurement arithmetic functions, add/subtract/multiply/divide/merge measurementSupport for the Behringer DSP1124P, FBQ2496 and DCX2496, QSC DSP-30, Crown USM 810, MiniDSP, ADA, Emotiva UMC-200 and XMC-1, waveFLEX DSP A8, Xilica XP2040, Anti-Mode 2.0 Dual Core and Outlaw Audio Model 976 equalisersAutomatic 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 responseWaterfalls of predicted results of EQ can be viewed in the EQ panel and can update live as filter settings are adjustedRoom 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 decayRoom SimulatorFrequency response import from and export to text filesImpulse response import from WAV or AIFF filesExport impulse responses of measurement or filter settings to WAV files with 16, 24 or 32-bit resolutionCompensation for C-weighting when using an external SPL meter as the input, calibration files can be loaded for soundcard and microphone or SPL meterASIO supportComprehensive help files within the application and on-line