Hello acoustic experts,
I bought a can of "Great Stuff" expanding foam spray tonight to use in some holes I had to drill in my ceiling joists to run speaker wire for a 7.1 setup. I thought I might try to spray some of it into the outlet boxes in my daughter's room next door to try and get a better acoustical seal between her room and my theater. Will this provide any benefit or am I just wasting my time? If it does provide benefit will it be noticeable or should I still spend the money and get a decent acoustic caulk instead?