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There is a construction site next to my bed room and especially low frequency sounds resulting from heavy machines and vehicles enter my bed through its four legs. As I am a side-sleeper the vibrations end up on my ear through the mattress.

What would be a reasonable construction of layers or materials that I could shove under each of the four legs to prevent sounds from being lead into the bed?

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  • Anything very soft, really. Folded towels might do the trick. However, you might find that the sound isn't coming through the bed legs at all. Low-frequency sound moves a lot of air, even through walls.
    – isherwood
    Feb 5 '16 at 16:06
  • The kind of sound I'm trying to absorb is rather mid-frequency sound from stomping, running, jumping, bumping etc. travelling via the floor.
    – Raffael
    Apr 4 at 9:28
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I don't think it's practical to come up with a definitive answer without experimentation, but I would try these:

  • sheets of rubber, such as what is sold in the plumbing section of the hardware store, maybe folded over a couple times
  • sound isolating feet sold for washers/dryers
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  • Rubber / foam would be the common wisdom approach. But otoh it seems that mass is what absorbes sound. So iron or stone / concrete slabs would be more effective I'd assume.
    – Raffael
    Apr 4 at 9:25
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Mass absorbes sound. As I haven't been using my larger dumbbell plates in a while I'm using them now as a layer between floor and bed legs - 10kg each. It's hard to say how much it actually improves the situation but I can confirm that it does improve sound insulation at least somewhat. Recommended for people sleeping in ear-on-mattress positions.

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