Room acoustics comes to the Mac in Electroacoustics Toolbox 3.2

Have you been looking for a tool to measure the reverberation time, early decay time, clarity and definition of a listening room, auditorium, or concert hall on your Mac? With version 3.2 of Electroacoustics Toolbox, the search has come to an end. Within Electroacoustics Toolbox 3.2 you will find a new room acoustics analyzer tool (sold separately) that puts room acoustics analysis in your grasp.

The new Room Analyzer tool in Electroacoustics Toolbox employs the integrated impulse response method to calculate reverberation time, early decay time, center time, clarity, and definition, as defined in the ISO 3382 standard. The Room Analyzer also allows you to adjust the Schroeder decay curve integration limits with either a click and drag of the mouse or with two independent data cursors. You can plot the calculated room acoustics parameters versus whole or 1/3-octave band center frequency.

Room Analyzer Features:

  • Directly analyze impulse response (IR) data acquired in the Dual FFT Analyzer or Oscilloscope tools.
  • Import impulse responses acquired from other apps and stored in AIF, CAF, or WAV audio files.
  • Export calculated parameter values to CSV, TXT, or MAT files, with the option to include raw IR data.
  • Save impulse response (IR) data to AIF, CAF, or WAV audio files.
  • Save high-resolution plots to PDF files.
  • Analysis
    • Calculate room acoustics parameters according to ISO 3382, including T20, T30, T60, EDT, Ts, C50, C80, D50, and D80, over the entire audio frequency range, or in whole or 1/3-octave bands. Low, mid, and high frequency values for each parameter are also calculated.
    • Plot room parameters versus whole or 1/3-octave center frequency.
    • See the Schroeder decay curve and regression line plotted over the squared IR and manually fine tune the decay curve integration limits.

For whole and 1/3-octave band analysis, the Room Analyzer supports data with sample rates of 44.1 kHz or 48 kHz.

Room Analyzer Screenshot

Electroacoustics Toolbox 3.2 also brings back the Noise Dosimeter tool that was previously available in version 2. The Dosimeter tool is also sold separately.



A free trial of Electroacoustics Toolbox is available for download from

The Toolbox is also available for download on the Mac App Store.


RoomScope and IOScope measure longer IRs and use 64-bit FFTs

RoomScope 1.2 and IOScope 2.3 arrived in the iOS App Store this week. Both apps now support impulse response measurements up to 16 seconds long and use double precision (64-bit) FFTs in their measurements. The maximum measurement length is dependent on the amount of memory available on the device, so 16-second measurements are currently only supported on the iPhone 5, iPad 3, and iPad 4. The previous generation of devices, including the iPod touch 5, supports 10-second measurements, and older devices are still limited to measurement durations of 5 seconds or less.

RoomScope 1.2 also offers the following additions:

  • Center time has been added to the list of calculated acoustic parameters.
  • All parameters are now calculated in low, mid, and high frequency bands, as defined by the ISO 3382 standard.
  • The calculation of the clarity and definition parameters (C and D) compensates for the delay of the whole and 1/3-octave band filters, as described in ISO 3382.
  • Raw IR data can now be excluded or included in CSV, MAT, and TXT file data exports.

RoomScope turns your iPad, iPhone, or iPod touch into a room acoustics measurement and analysis tool. With RoomScope, you can measure a room impulse response and then calculate reverberation time, early decay time, center time, clarity, and definition, as defined in the ISO 3382 standard. RoomScope also allows you to adjust the Schroeder decay curve integration limits with the touch of your finger and plot the calculated room parameters versus whole or 1/3-octave band center frequency.



Download RoomScope 1.2

IOScope brings true dual-channel transfer function and impulse response analysis to iOS. With IOScope, measure loudspeaker impedance, frequency response, and sensitivity. Measure a room impulse response. Tune a large sound reinforcement system, time-align a set of surround sound speakers, or optimize your home stereo. Determine the actual cutoff frequencies of your latest speaker crossover circuit, or teach your students the fundamentals of Fourier analysis of dynamic systems.

Measure frequency response magnitude and phase, coherence, and group delay. Time domain functions enable you to measure impulse response and auto/cross-correlation. IOScope includes a built-in signal generator for producing suitable excitation signals to analyze your system or device under test (DUT). See for a video demo of loudspeaker impedance measurement.


Download IOScope 2.3


RoomScope 1.1 offers additional detail

RoomScope version 1.1 for iOS is now available for download on the App Store. The new version offers the following improvements:

  • RoomScope now employs a more sophisticated approach to determine the onset of the direct sound in the impulse response.
  • All calculated room acoustics parameters for all frequency bands of the current filter bandwidth can be displayed simultaneously in a table.
  • An option has been added to plot the regression line used in calculation of reverberation times.
  • Cursor behavior is more robust.
  • Minor bug fixes.

Screenshots of the new version are shown below.

RoomScope IR RoomScope Parameter RoomScope Parameter Table RoomScope Squared IR


Download RoomScope

Faber Acoustical brings room acoustics to iOS with RoomScope

Faber Acoustical is pleased to announce the immediate availability of RoomScope for iOS on the App Store.

RoomScope both measures and analyzes room impulse responses, calculating acoustical parameters such as reverberation time, early decay time, clarity and definition. Room acoustics parameters may even be calculated and displayed in whole or 1/3 octave frequency bands.

RoomScope offers users the ability to measure the acoustic response of a room, while viewing the impulse response, frequency response, or coherence dynamically as the measurement progresses. RoomScope’s dual-channel measurement capability enables users to employ built-in frequency sweeps or pseudorandom noise as a reference, or to work with arbitrary test signals from another source.

Room parameters, which are calculated by RoomScope using the integrated impulse response method of the ISO 3382 standard, include reverberation time (T20, T30, T60), early decay time, clarity (C50, C80, Cte), and definition (D50, D80, Dte). Users can use dual cursors within the plot of the squared impulse response to dynamically set integration limits for the decay curve.

Measurement data and calculated acoustic parameters may be exported to CSV, TXT, or MAT files. Impulse response data may also be stored in AIF, CAF, or WAV audio files. RoomScope additionally supports loading impulse response data via audio files created or opened in other apps, such as SignalScope Pro.

Download RoomScope

iPhone 5 screenshots

RoomScope Impulse Response iPhone5RoomScope Decay Curve iPhone5


iPad screenshots

RoomScope Impulse Response iPadRoomScope Decay Curve iPad



1 2