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MJC

In article ,
says...

"I can imagine a method that used heat to move the air, perhaps with a
plasma to make it fast. "

The singing arc.

However it depends on how you want to be about this. If someone want no moving parts that is fine and the singing arc works for that.

But your eardrum still moves as well as the linage from it to the cochlea.

Plus the fact that the air itself moves.

That recalls some old saw about whether anything is real if not
observed. I think sound has been reproduced even if no-one hears.

As to moving air counting as a "part"... In space no-one can hear
spurious arguments!

Mike.