Hello, Im a newbie looking to build a ~5-6kish (electronic only) home teather. I looked around a bit but I couldn't find my way. Dont hesitate to toss me links on things I should be reading. That being said, I would like to build a projection room. I am not sure if it will actually fit, but I'm looking to build a projection room with a ~110ish screen, a 1080p projector, a 5.1 sound kit and some sort of soundproof isolation. I used to build computers for a living so I am up for pretty much any kind of DIY as far as it goes with electronic. I also have a friend that will help with building the room, so level of DYIness is something around 8/10. I am building this in my basement. The basement actually is unfinished so I have a bunch of freedom. What I am trying to figure out right now is what kind of division and materials should I look for. Here's a plan of my room and plan : 1 - I was thinking of 2 sheets of drywall on each wall for isolation, along with resilient bars. Is that enough to cut most of the sound? Should I look for something else? 2 - Carpet on the floor, right? 3 - Does the room has to be rectangle? How bad is the impact of non-rectangular room on sound? For instance, the back of one of the room is not totally closed because it leads to the staircase. Would heavy curtains help? 4 - Does the seating has to be in the middle of the room? How bad is the impact of sitting at one third of the room (from the sides)? If it's a problem, would another set of curtains fix this? 5 - Is haging ceiling any good soundproof wise? I like the idea of being able to move stuff around even when finished. Thanks!