I am helping my neighbor plan a new home theater - the catch is, we live in a townhome with a common wall. We are discussing the best way to control the noise I hear in my home when he plays his Surround Sound movies. He says that I should build a sound wall on my side of the common wall (which affects my master bedroom and living room). I think he needs to stop the noise at the point of transmission (on his side) by adding a mass-loaded vinyl barrier, thereby reducing the sound that is passing through the wall structure before it hits the wall. Any thoughts or experience? Thanks.