Why are they called "Push-Pull" transducers?

Transducers inside each endcap on the titanium rod produce cyclic positive and negative pressure waves at the frequency of operation (30 kHz or 45 kHz). The positive pressure wave acts as a pushing force on the titanium rod and the negative pressure wave acts as a pulling force (hence "Push-pull").

The pushing and pulling action causes the titanium rod to resonate at the frequency of operation. As a result, near perfect, omnidirectional radiation of sound waves is achieved.

 

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