Guidance on room setup

[ONV]

Hi,

I’m in the process of planning a total renovation of our old house and have a room in mind for a home theater.
Current room size (W x L x H): 2,8m x 5m x 2,18m or 9.2ft x 16.5ft x 7.2ft
Currently the room is a basement room with three walls in concrete with thin layer of plaster and the fourth wall is a normal drywall.
Plan is to build a room-in-room solution in the end.
My questions for the group are:
1) Any concerns about room dimensions (distorting sound waves etc.)?
2) Any knowledge on roughly how much space I’ll loose with a room-in-room solution (W x L x H)?
3) For minimal loss of space I thought about the Dreamscreen U-boats for floor and Prosilence clips for walls and ceiling. Anyone have any experience or concerns with such a system?
4) Any other comments, concerns or things I should be aware of?
5) I'm particularly concerned abouth the width of the room, anyone else running narrow rooms with success?

 

[TheWarrior]

I wouldn't spend the money for a room-in-room. You cannot afford to sacrifice any more ceiling height, and 2.8m wide already limits you to two chairs side by side - of course you could still add more rows of chairs.

Find a local acoustic treatment company that can provide affordable diffusion products, and place them behind your front speakers. I would use one of the 2.8m concrete walls as the Front of your system. So you'll need to decide what size display will go there and how the speakers can fit around it all. Due to the narrow size, I recommend diffusion behind the Front speakers rather than absorption because you want to let the sound bounce around as much as possible so that the room can sound a bit larger than it is.

All enclosed spaces have room modes/resonances. You can predict them by taking a Length, Height, or Width dimension and dividing it into the speed of sound. 1131fps or 345ms. Acoustic measurements allow for you to program DSP filters to trim any room induced peaks.

If you plan to have copious amounts of bass, you will need some absorption as well. I recommend starting with your normal room furnishings, big padded seats, big pillows, that sort of stuff. Tightly packed bookshelves are also great to provide both absorption and diffusion, which may fit on the back wall, for example.