AVS Forum Special Member
Join Date: Aug 2001
Location: Lynnwood, WA USA
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The biggest problem that I see is the people in the back row being able to see the bottom of the screen.
Next on the list would be speaker placement, not just for the left and right speakers, but also for the center. If your screen is not acoustically transparent, you really only have two viable solutions, above or below. Both have compromises and will limit the size of your screen. The left and right speakers will also need room on either side of the screen to fit.
Your riser looks like it may be rather tall for your ceiling height. Make sure that people will be able to stand up without bumping their heads. Consider making the riser lower and using a "mini-riser" that is just under the furniture, raising up the seated height 3-4", but allowing more standing height.
If you are looking for "soundproofing", there is really no such thing, although the term is used commonly to refer to sound isolation. For all practical purposes, this needs to be dealt with in the structure of your room in the construction phase. There is nothing that you can effectively hang in the room that will keep sound in or out.
Anything that you attach to the walls or ceiling should be thought of as "sound treatment" to control reflections within the room, not keeping sound in or out.