Generators

I am designing a generator with variable frequency and voltage; the specs for my transducer are P=50w Cs= 4nf Zm<30ohm F=44khz (cleaning transducer). I do not understand the relationship of these specs and the fact that I keep seeing 600 volts supply for some of the circuit designs?
What is the type of signal do they use positive square, negative square, square, full sine?
Thanks shon

;D

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