Hi All, I did a search of this forum but couldn't uncover the answer to a question my parents had as they build their HT room. What is the best kind/type of insulation to maximize soundproofing in their room? I don't know much about this so I'm not sure what else I could tell you. I know different insulation has different "R" values - is there a recommended value for HT rooms? They're not HT nuts like me, and they don't want to go too much out of their way in terms of soundproofing. But, they do want to consider the best insulation type. They may also install soundboards - any advice or thoughts on that? Thanks for the help!