Getting to a wideband driver that can cleanly do upper frequencies (above approx 3k to maybe 10k) is an art that few driver designers can meet.
It's very tough to do, with regard to being capable in all directions required. Generally...the more wideband a driver is... the more restricted it is in some vital areas.
Some/most are very aurally sensitive to the distortions created in these drivers that attempt such wideband behaviour, and this is why you don't see many of them out there.
For example, the crossovers in white van speakers generally run the midrange drivers wide open on the top. You don't see anyone crowing about how good they sound.
It's a complex subject, but the point remains that wide band drivers with all the requisite capacities are exceedingly rare, and pretty well all have shortcomings of some sort..
It's very tough to do, with regard to being capable in all directions required. Generally...the more wideband a driver is... the more restricted it is in some vital areas.
Some/most are very aurally sensitive to the distortions created in these drivers that attempt such wideband behaviour, and this is why you don't see many of them out there.
For example, the crossovers in white van speakers generally run the midrange drivers wide open on the top. You don't see anyone crowing about how good they sound.
It's a complex subject, but the point remains that wide band drivers with all the requisite capacities are exceedingly rare, and pretty well all have shortcomings of some sort..