Sound proofing panels and other equipment - What is the best out there right now

Due to my father-in-laws reduced mobility, my in-laws are letting go of their house and have bought a condo in a seniors oriented building. My father-in-law is a big home theater buff, and does like music, so the goal is to turn one of the bedrooms, approximately 16*12*8 into a home theater, complete with reasonable sound-proofing treatment. I am reasonably versed in acoustics, and so far, the several contractors I have talked to have not inspired confidence on being up on the latest "tech".


I would be very interested in any suggestions people would have for modern sound-proofing products they have come across. I am sure I can find a contractor I can trust to do good work, I just think they may need a push to achieve the best results possible.  The contractor can handle the usual issues with sound-proofing.


While money is always an object, the are fairly comfortable and can't enjoy all the usual toys any more, so an appropriate amount can be spent, and they are both in excellent health so will enjoy it for many years and hopefully it will become a hub activity with their friends.