Currently, my home theater is in the basement of a two-storey home. I havne't done "anything" of significance to quiet the theater from the rest of the house, but since my house is old (75 years), my wife and son cannot hear anything when I am watching movies at near reference levels (-10 dB) when they are asleep on the second floor. So my question is now this... We are looking at moving, and potentially to a bungalow/ranch. With only one floor between us, how much sound proofing will I need to do? I am willing to invest some money and time to get it right, but to what extent will I need to? For a theater roughly 200 sq ft, how much money will I need to spend to turn an average drywalled room into a vey quiet drywalled room (not using any expensive 3rd party boutique materials)? Do any of you have similar stories? What are your results? Can your theater be heard in the adjacent/upstairs room? How much so, and how much quieter since the "sound proofing" took place? Can a young child sleep through the sound now? Thanks.