Download of QuickAudioSonar 1.8.2 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The application is included in System Tools. This free Mac application was originally produced by Hans Petter Selasky.
From the developer:
Quick Audio Sonar is designed to help you tune your professional audio system. It gives information about frequency, phase and can correlate two different audio signals to measure audio delay. For a quick start, you can press the apply button. Then, you whistle and watch the graph detecting your whistle tone. If nothing is detected, you select another input or output device by pressing the DSP RX and DSP TX buttons respectively.
You may want to check out more Mac applications, such as Portable Nvu, SpaceReporter or iSurveill, which might be similar to QuickAudioSonar.