Underfloor cans in between joists
Stick some boxes of crushed cans beneath the floors, like they’re insulation.
Maybe do small/medium rectangular plastic or cardboard boxes. And either glue them in, or use some sort of “friction” fitting system. I’m not sure how. Maybe the boxes are 400 by 600 mm. And 100-120 mm thick. Get them in there however it works.





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