I would listen to Jeff then. A movie with heavy use of subs and sound will go throughout the house. Tv watching would be fine. Mad Max Fury road, a different story. I planned my house around the home theater. Dedicated attic space above a large garage, the garage is attached, but by a long hallway. The theater room has dedicated steps, HVAC, and is totally isolated away from the house.
Go ahead and buy the sub you plan on using. Plug an old cd player into the inputs. Play it. Then you can start your soundproofing from there.
For those about to rock we salute you!