I would have to agree with others as I have an audio rack (3.1/2' tall), a TV and TV stand and couple of plants between my speakers. It will likely be a weak link in your system or speaker placement. Have you tried repostioning your speakers? I played with my speaker placement for days (if not weeks) before I got it right. Now I have good depth & hieght with reasonable width. Your room is going to play a big part in soundstaging as well, I know mine does.
Good luck.
Good luck.