Depends ...
Any room will have its own accoustical properties. What's worse is they can drastically change with the type/amount/placement of furniture, pictures, wall coverings, people, flooring, etc etc etc. For example, my last room had a 1 second echo when empty. Once all the "stuff" was in it was dead.
The first thing you can do, if you don't like the sound you are getting, is run the EQ program on your receiver (assuming you have that). Something like Audyssey. I had a horrible standing wave on my sub that was corrected by Paradigm's PBK kit.
If that still doesn't make you happy then there's a lot of other stuff you can get into but I'd start there and see how it goes.
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Open questions: How far along is this room? Is it done? Still need flooring? Also, is this mostly HT or is music in it as well? I prefer dead rooms for HT but music ... music needs reverb.
