If you want to challenge the resolution capabilities of something like a Sonus Faber, you may need to increase budget a bit, but it's hard to know for sure without trying them all. As mentioned, Seas and Scanspeak are excellent,...maybe look into SB, Satori, or Morel too. You may find some used stuff too.... Vifa, Focal, Audax, Dynaudio Peerless, etc.
Midbass under 100$
Hi, i have some sonus Faber concertino with a nad 3020
I love their warm sound but they have lost some "health", since I have already built some speakers i thought that i could do it again and build something that sounds like or better that my sonus Faber, the only thing is that when I built my speakers there wasn't so many drivers out there, is was an easy pick, but now, i want to get the best drivers for the price that i can get, could you help me?