baghead

For any of you who are thinking about building a center channel... I noticed a single kg3 for sale on eBay. Auction #1237827631

Along with all the other excellent suggestions, you also need to consider speaker angle and position. Are they pointed directly at your ears and far from the wall? Additionally, is your room much bigger than the audition room?? Obviously, neither of these alone will create the problem you are describing, but it may be a contributing factor.