Vaulted ceilings can result in broad bass peaks depending on which wall the speakers are positioned on. I have such a problem with my own large room but have gotten extremely gratifying results by using a dbx equalizer to reduce that peak and even out the balance. As stated, a large area rug with a pad underneath if possible would be a good place to start.
Next, I'd try the speakers on a different wall if possible and change the listening position accordingly. If that doesn't work or is impractical due to the room's layout, then a decent room equalizer would be your best bet.
Next, I'd try the speakers on a different wall if possible and change the listening position accordingly. If that doesn't work or is impractical due to the room's layout, then a decent room equalizer would be your best bet.