Where you really want one driver to be reproducing all frequencies is in the heart of the music---the midrange. The Eminent Technology LFT magnetic-planar driver reproduces 180Hz to 10kHz, with no crossover in that range! In the LFT-8b an 8" dynamic driver in a sealed enclosure does 180Hz down, a ribbon tweeter 10kHz up.
Perplexed on how single driver speakers can cover such a large Hz range
I googled till I was blue in the face. I've always wondered how in the world the cone of a single driver speaker, with no crossovers, at any given ten thousands of a second, be vibrating a hefy 60Hz and also a sizzling 10 kHz. To me it's like quantum mechanics. I don't understand. I just have to accept.