My room will be a home theater it will have 2 outer walls with a window each and 2 inner walls, it will be above the garage I think i will use the Golden Cuboid as it seems to be the best for home theaters so around 23x14x9 My understanding is that SIPs arent great for music, i assume that applies to movies and games as well, is there anything i can do to improve it, should i build a drywall room within the SIP room? The SIPs that i am currently looking at have this: The fiber cement panels of 5/16 inch thickness or greater, attached to both sides of a core of expanded polystyrene (EPS) of specific density working together as an element that creates a monolithic piece of certain features

Mass absorbs sound....Could do a 1-1/2 in concrete heated floor? Multiple drywall layers....need more mass.... Cellulose is 4 times the mass of fiberglass....