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Bass trapping is for taming room modes, not transmission problems, so it won't work for your problem. You need to add mass to the walls and ceiling - multiple layers of sheetrock. If you also add a layer of something like Auralex Sheetblock or thin sheet lead it will help a lot.
In the mean time I suggest that rather than resorting to murder, which is rather drastic and permanent, you simply apply a medium sized lemon and a roll or two of duct tape.
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