Waxx
Major Contributor
You can also use inwall speakers. There is a Kef Ci200RR that is measured here and is quiet good for this. But it's over budget. It's cheaper Ci200QR (900€ for a pair) is also very good. I have heared it more than once, but no measurements, but i would not be surprised that it's not far off the Ci200RR, and inbuild it gives a decent neutral sound with real bass till lower than most bookshelfs can go as long as you don't play too loud. Amps can be cheap today (see the test database) so that could be a good setup for such a (relative) small space.
Otherwise, a Genelec 8030C wallmounted to the ceiling is very good, i use them like that weekly in the radiostudio where i broadcast every week. A sub can help for bass on high volume, but on reasonable volume, the wallmount acoustic effect helps enough to get deep bass actually. It may not be 100% perfect, but it's not really muddy in our case neighter.
Otherwise, a Genelec 8030C wallmounted to the ceiling is very good, i use them like that weekly in the radiostudio where i broadcast every week. A sub can help for bass on high volume, but on reasonable volume, the wallmount acoustic effect helps enough to get deep bass actually. It may not be 100% perfect, but it's not really muddy in our case neighter.