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Treat the 4 corners with the biggest traps you can manage. Superchunks are good.
The window is probably functioning as a bass trap already. Thump it gently and you will hear the resonant frequency. Leave it alone. You many need trapping on the back wall to prevent a flutter between front and back. Move the speakers about to 'tune' the SBIR. It may even be useful.
Read Ethan's link, it makes sense. And I have tested it here. It is true.
DD
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