OP
Looks like you found the speaker you are going to enjoy, the Volti Razz. i have not heard a Volti, but its reviews are very good.
if it were me, i would see if i can get to audition a Fyne, just to cover my bases. I know it quite difficult to listen to all speakers, but if you happen to find what you wanted, then stick to it. I used every opportunity to listen to gears in audio shows. So, i can determine what i want. it's not the end all, but to benchmark what I wanted. Hopefully the Volti is your end game. Then build the corresponding amp combination around it