Those Charney Audio speakers look great and have some excellent reviews. It looks like the company is not too far from me in NJ.
Another single driver variation is the Voigt Tube like what was featured in this Tech Ingredients video:
https://www.youtube.com/watch?v=EEh01PX-q9I
Another single driver variation is the Voigt Tube like what was featured in this Tech Ingredients video:
https://www.youtube.com/watch?v=EEh01PX-q9I