Your problem's aren't the sim's fault.
What are your speakers, preamp, and sources? More importantly, how are the speakers setup in your room, and what is going on for acoustics?
Have you treated the front wall, back wall, side walls, and ceilings for reflections?
What are your speakers, preamp, and sources? More importantly, how are the speakers setup in your room, and what is going on for acoustics?
Have you treated the front wall, back wall, side walls, and ceilings for reflections?