If you are forced to be in the back of the room then I would NOT recommend diffusion but absorption and it should be pretty thick. If making your own look to see if you can find mineral wool or OC 703/705 in your area.
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You see, since there are so many designs around the net, I was thinking of simply buying one of those ikea shelves that look like a bee-hive (empty cells) and DIY some cubes with a swinging membrane, perhaps rockwool inside. That would make an area of about 2x2m - 37cm depth bass trap right behind me.
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Not sure what kind of plan you are thinking of doing, but I would just make some panels out of MW or OC stuff and straddle corners. No need to get into some kind of swinging membrane thingy.
Glenn