QAudioOutput does not work for frequencies 8000, 16000, 24000 on Mac OS X

Setting the frequency in QAudioOutput to one of 8000, 16000, 24000 causes the class to hang. Setting to 8100 works fine. Duplicate by changing the frequency (DataFrequencyHz) in the supplied examples/multimedia/audiooutput/audiooutput.cpp from 44100 to 8000 (and then 8100). The application will hang with brief output and not allow buttons to be pressed.