Sentence:  Adult male speakers can <WSD>phonate</WSD> at fundamental frequencies that range between 80 and 300 Hz. Adult females and children normally <WSD>phonate</WSD> at fundamental frequencies that range up to about 500 Hz, although the fundamental frequency can go up to 1.5 kHz [...] 
Meaning of the word marked with <WSD> tags:  To make sounds with the voice.