Didn't read the above posts, however a hardwood floor will cause reflections from your speakers, if you like it or not. This will change your imaging and the definition of instruments. Try it. If you like it, fine... if not, you'll have to use the dampening effect of a rug at the critical spots.
Hardwood floors vs Carpet
I am about to pull my carpet flooring to install wood flooring in my home. I had a non-audiophile over who stated that the acoustics will change with the addition of wood vs carpet. It dawned on me that he was likely correct. Anyone know what changes in sound could be forthcoming with wood flooring? I have recently got my system to sound like ive alwasy wanted and hope this home improvement doesnt serve to be a audio downgrade.