Good monitor speakers for x1850?

With loudspeaker recommendations it’s always a thing. Everyone has a different sense of hearing.

The best thing to do is to listen to a sample in a good professional shop.

If you have little space I would use 5 “or 6” monitors - if you are a deep-bass fan then an additional subwoofer

Personally, I have had very good experiences with the KRK and JBL 305 MKII - Genelec and Neumann are then already luxury class at appropriate prices