I have placed my Vanguard Scouts in a 'Compromised Location'. Mainly because of other factors of life. My main listening room is occupied by a Very Large Horn System, and the Scouts are doing duty in my Upstairs Great Room for TV, Movies and Background Music. The Bass can get a bit boomy because of this location. They are on a book shelf, with 10 inches behind the speaker. They are basically inside a small 'cavern'. (Picture Attached). I am thinking that a Port Plug of some type would help with this situation. What would you recommend for this?