I always recommend spending as much on room treatments as monitors, mics, or other gear. It really makes the biggest improvement IMO.
I have never understood why audiophiles spend hundreds of thousands of pounds/dollars/euros on equipment but put it in a shit sounding room. A half decent setup in a well treated room will sound better for a fraction of the cost. Guitar speakers are no different; even a Vintage 30 isn’t immune from the laws of physics 🤣