To convert M4A to WAV, click the small triangle to the right of Profile and set WAV-Waveform Audio (*.wav) as the output format from the General Audio category. You can also do some basic settings in Setting... button.It is easy to output the 16 bit WAV and 24 bit WAV.tep 3 Start M4A to WAV Conversion. Press Convert button to convert M4A to WAV. Once conversion is completed, simply convert Open folder to locate the converted files and start enjoy. Conclusion. With M4A to WAV Converter, converting M4A to WAV on Mac and Windows is just simple.