Id say you're done if you like what you hear. Not all rooms need treatment and getting too far into audiophelia is just a waste of time and money. My room is treated perfectly with the furniture and rugs and books etc. Don't look for faults, they'll find you. If they don't you don't have any in your room. If you want to try power cords try Morrow. They have a 60 day trial. You have a killer system.