How to sound proof your home movie theatre
Here are a few tips to help you soundproof your room
Firstly, add mass to your walls. Mass impedes the transmission of sound. You can use a number of drywall layers and stack up the total mass of that wall. On a common single wood stud wall, doubling the number of drywall layers yields 4-5dB of improvement.
Secondly, add mass to your floor. Sound bouncing off the hard floor creates an echoing effect on your ears. Lay a thick carpet on the entire floor with a good slab rubber padding underneath. It will do a lot of good and justice to your sound system with this little investment on the entire floor. The rubber padding not only adds mass to the floor but also gives your feet a comfortable springy feeling.
Thirdly, create a false ceiling. You can use drywall for this purpose also. There is no need to feed anything in between the ceiling and drywall. The vacuum would not do any damage to the sound in the room but instead would absorb it. Some would recommend egg crates or paper boards, but they are actually quite useless in absorbing noise.