acoustic analysis


Acoustic Analysis Modules

third detail

RTA — Octave and 1/3 octave spectral analysis.

Includes cursor readout of dB bands, max & min lines, noise curve overlays, pink noise generator, and optional STC Transmission Loss.

Meets all ANSI and ISO Class 1 standards for filter-based RTA measurements. Built-in NC readout. Includes support for the optional Reference Curves feature.

Included free in the AudioTools app.

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FFT — Fast Fourier Transform analysis for extremely detailed acoustics work. Two ranges, 20-20kHz, and 5Hz – 3100Hz.

Up to 32k FFT, smoothing, decay, peak frequency tracking, overlays. Includes support for the optional Reference Curves feature.

Included free in the AudioTools app.


ETC — Energy Time Curve. Plots the decay of an impulse over time. Also computes RT60 from the curve. A, C, and octave band filters are available. Speaker delay may also be measured.

See our new demo video of this module.

Available as an in-app purchase in AudioTools.

Impulse Response — Record an Impulse Response audio file, and then analyze the IR for commonly used metrics. Both the data and IR can be uploaded to a PC or Mac. Demo videos are available. Measure 1/3 octave RT60, clarity, definition, EDT. Includes 3D Waterfall plots and windowing for loudspeaker analysis. Split screen mode on iPad.

Available as an in-app purchase in AudioTools.

Smaart® Tools I — Single-channel spectrum measurements ported from Rational Acoustics Smaart 7. Now you can have the power of the most popular acoustical analysis software on the iPhone / iPad platform.

Includes octave to 1/48th octave spectrum line and bar plots, and the spectrograph. Split graphs on iPad.

Available as an in-app purchase in AudioTools.


Transfer Function — A true two-channel transfer function, complete with magnitude, phase, and coherence plots, coherence masking, and a sample-accurate impulse response-based delay finder.

Requires a two-channel audio interface for full use, such as iAudioInterface2, but also works with the internal iOS device mic for analysis using the built-in pink noise generator.

Available as an in-app purchase in AudioTools.

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LARSA – Loudspeaker And Room System Analysis

LARSA is a powerful yet simple to use loudspeaker performance analyzer. Using a quick swept-sine wave signal, it computes the magnitude response of the system. Take multiple measurements quickly and average them, to balance out room modes. EQ your system for optimum response.


Available as an in-app purchase in AudioTools.

Gated Noise RT60

Gated Noise RT60, also called the Interrupted Noise or Dropped Noise method, is a tool for measuring the reverb decay time in a room. It is based on the international standard ISO 3382, “Acoustics — Measurement of reverberation time of rooms with reference to other acoustical parameters”.

Transmission Loss

Transmission Loss (TL) is a tool for measuring the insulating properties of walls, floors, or doors separating two rooms. It is based several international standards. Measure Sending and Receiving room 1/3 octave levels, and also measure Reverb Time (RT) and Ambient Noise in the receiving room, if desired. Everything is computed automatically and the results appear in a professional-looking graph ready to export and add to your reports.

ACU – Audio Coverage Uniformity

Audio Coverage Uniformity, or ACU, is based on a new standard developed by ANSI and InfoComm, released in June 2017. The standard is 102.01:2017, and its purpose is to measure and quantify how evenly the sound system covers the room. Basically, a number of measurements are done throughout the venue, and the differences are tabulated and compared, to arrive at an overall value.