I wouldn't touch at all a DSP speaker as you only can make it worser even when you have "better" driver. It's not a simple game here.
What should can a better chassis make here?
When you change a driver, you have no access to adjust parameters correct, you only can make a sound what you "prefer" but you are destroying now a optimized system. You are changing timing, phase, amplitude frequency range and you are expect that that will sound better when you have no "tool" to adjust/correct all that parameters?
When you want more "resolution" or better voices, start with basics like room acoustics, main power distribution, cables better equipment.
Tell me what's "wrong" with your sound, the status of your room your mains, your cables your musical preference and maybe we can help.
Of coarse you can do what you want, but I would be very careful to make things like exchanging a driver.
Robert
800v3/218/271/8k.2/5k5s

/5kC/DSP3200/Reviver/
TT-ELP/Graham Slee Revelation/Trinnov Altitude 32/OPPO 205
__Ayon/HB/Shunyata/Miltzow -- power cables,
__Ayon/Jungson/Miltzow --analog, Miltzow-- digital,
__Vortex/WMA ,