@faustuss
Interestingly, you have to keep a supply of ionized gas around which in effect acts as the diaphragm as the plasma excites the atoms of whatever gas it is producing sound. When the gas floats away or is dissipated though, no more sound. Not very practical or I would assume, cheap.
In reality, no one has ever improved on the good old dynamic driver which people in the know are always coming up with new ways to configure and implement this legacy technology to achieve whatever sonic milestone they desire for less money and hassle and what the market will rationally except.
They use a pulsating plasma flame to excite the air itself. No need for an external gas supply.
They're lifespan is extremely long, since there are no moving parts.
Another company that uses ION tweeters, which I like even better than Acapelle, is Lansche audio. I heard their speakers at T.H.E. SHow last year.
Their ION tweeter, if it needs to be replaced, is less expensive than other high end speaker's tweeters.
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