Things that make you go hhhmmmm
Not advanced this far. It has been around for decades. If you do not need volume or bass. Listen to single driver and you’ll start to hear the crossover in regular speakers and understand why point source speakers are the holy grail of speaker design if you can live without treble or bass. And if you try to gain bass, you’ll loose the midrange.
Consider Vandersteen sells his 2-way coaxial for maybe $3k. But to get bass, expect to pay an additional $40,000.