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I am wondering if it is possible to build a one-cubic-meter soundproof space or other similar size of soundproof space.

Why would I need this? I am planning soundproof my house, although I am new to soundproof. So, if I can build a group of test spaces with different solutions, I can get a comparison result to decide which one is suitable to. the smaller the size of test space, the less cost I spend.

So, what is the minimal size of a soundproof space I could build?

Note: both inside and outside of the test space is full of the normal air as the daily environment we live in.

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    There's no minimum size really; it just depends how big the thing you need to put in it is. I knew a guy who built a DIY Anechoic chamber of about the size you're talking about for testing his homemade loudspeakers. – Nate S. Jan 30 at 23:41
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    I agree there is no minimum size but scale matters what works great for a small area may not work well on a large wall.+ – Ed Beal Jan 30 at 23:53
  • @NateS. Is it possible to share his solution? – zghqh Jan 30 at 23:55
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    yes, a one cubic meter container with the air removed would definitely be a soundproof environment – jsotola Jan 31 at 0:21
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    I just watched a video on soundproofing an hour ago, someone had linked it in another question. Turns out there is an industry standard for soundproofing including rating numbers (40=minimum, 60=quite good). So don't reinvent the wheel. – Harper - Reinstate Monica Jan 31 at 1:08
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A small-scale model won't produce accurate results. You will have different standing waves, resonances, and modes in small cube than an odd-shaped real-life room. Different cube-lining materials will provide a baseline relative comparison, but the results shouldn't be extrapolated to a real-life situation without careful acoustical modeling.

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There has been extensive testing done with various ways of sound proofing and the amount of decibel drop achieved by each method and different methods combined. There are staggered studs, RC-1 channel on regular frame walls and on staggered studs, with one layer of sheetrock or 2 layers, ratings using 1 or 2 pound mass loaded vinyl mat. Wall with insulation and more. It's out there to be read online, all you need is the keywords I have laid out for you.

But if you just want to have fun with it, then.....

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