Putting the surround and back speakers in the ceiling will work okay, especially with tweeters that can be aimed. However, generally speaking the seating area should be between the surrounds and the back speakers should be behind you to get the best impact. Seems like the back speakers should be at a 26 degree angle from the "hearing sweet spot." I put my subwoofer in a cabinet and at times it rattles the shelves and doors. I have felt pads on the doors etc to dampen the sympathetic vibration and it helps. My suggestion is to find a way to connect the base of the sub to the floor if you can. Using foam to dampen defeats the purpose of the sub. The solution may be to drill holes in the bottom shelf and create extensions for the sub's feet. Just a thought.
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