Are active monitors the way to go from here? When should I rather have a HiFi setup?
"HiFi" is becoming like vinyl:
-Do you like the aesthetic of HiFi speakers?
-Do you enjoy changing out componants like DACs and amps and/or seeing the glow of tubes or pretty cabling?
-Do you have several passive speakers you may want to try over the years?
If so, go with HiFi speakers.
If however:
-You want something that plays all genres equally well
-You want the most accurate, matched amp/dac and drivers to provide flatter sound.
-You just want to "see the music through a clear window" and not worry about chasing componants
Then I'd go with studio monitors. Keep in mind you get a little locked into one or the other if you get a source that outputs to speaker wire connections (HiFi) vs feeding studio monitors from XLR.
Note on the LS50 vs studio monitors: The LS50 has excellent vertical and horizontal dispersion, something even most studio monitors can't do. With most Hifi or studio speakers, you are locked in a vertical plane, and if you stand up during a movie, or have seats that are relatively close or at different heights, or ceiling or floor reflections, the balance of frequencies from low to high will change a lot with anything that doesn't use a coaxial driver like the KEF. The only other speaker I've seen that comes quite close and has a normal 2-way setup is the KH80.