Speakers will play even if they can't manage to play the sound. This will result is distortion and noise you hear. It can even result in the destruction of the speakers.
The way to debug this is to export the waveform to some format like ".wav" you can then run it in other programs to see if you get the same result. You can additionally examine the wavefile yourself for any error. Or compare to a waveform generated by another program, which probably give you the same result.
