/diy/ - Do It Yourself

>>1964583
lots of mass, thats the only way, those "sound proofing" oads are just foam that prevent sound from reflecting easily. look for mass loaded sheets

>>1964583
no

- make box with an inner box that's electromagnetically suspended
- create a vacuum in outer box

>>1964589
not OP, but that's a smart idea.

>>1964583
can sound enter an anechoic chamber?

>>1964589
I was gonna say vacuum chamber but see I already got beat to the punch...

>>1964583
submerge the box in a dense liquid like water.
vacuum

>>1964583
make a box of lead 10 feet thick suspended on rubber.

>>1964583
OP here forgot to mention the box needs to be big enough to hold a human

>>1964583

Look up the term "decoupled mass". Short of some bullshit high-tech solution like >>1964589 suggests, this is the way things are made soundproof. Lots of mass, lots of damping material. These can sometimes be the same thing, as is the case in materials like mass loaded vinyl.

>>1964605

Technically, yes. Anechoic only means that virtually no sound is reflected within it. That doesn't mean it's soundproof. That being said, any actual anechoic chamber you find will also be soundproof, because not doing that would be retarded.

Yes, vacuum gap and magnetically levitated. You'll never do this so give up now if you want it to be perfect. Some dude wrote an article on the concept for having a room that high-level politicians can discuss matters in absolute privacy. It's virtually impossible to be this perfect.
But you can make walls that are *good enough* that you'll never hear what's outside. A huge fucking wall of limp, dense mass will do the job. Like a shit ton of lead, or clay, or dirt.

Some background: I built for myself a dual-wall workshop where the outer wall was 2 layers of plywood, sealed air tight, and the inner wall was 2 layers of 5/8 drywall w/ green glue. Both walls insulated with rockwool. Double door, airtight with weather stripping. This was not good enough to create a truly silent environment, I was still able to hear low frequencies from the busy street next to my property.

>>1965017
>>1964935
So I take it would be impossible to do this on the small scale. Like small enough for a phone example.

Even if I had somehow made a tiny anechoic chamber that was suspended on wires with rubber grips and if I had also used mass loaded vinyl and green glue to encase it. It just wouldn't be thick enough I assume to stop sound going in and out?

Wow you really went all out. I think that's good enough desu. But does it prevent sound from going both in and out? Was there anything you overlooked?

Any windows? Did you soundproof the windows? Does it have a heater or airconditioning? How do you get air?

Theoretically if you had a 2nd wall that was a foot away from the outerwall. Would the low frequencies be gone?

>>1965078
No windows, no cracks, all gaps caulked. It took forever.
No air conduits at all, air had to be exchanged daily by opening the two doors.
>But does it prevent sound from going both in and out?
Technically no, there's always something transmitted even if it's inaudible to your ears.
For practical purposes yes. You could hear a loud air compressor just outside the room and it would be very quiet, but normal conversation were inaudible. Almost all street traffic, which is normally loud constant white noise all day, is inaudible except for the occasional very gentle low frequency rumble of a motorcycle or heavy diesel truck.

>Theoretically if you had a 2nd wall that was a foot away from the outerwall. Would the low frequencies be gone?
Theoretically no
My 2nd wall was about 2 inches away from the outer wall, fully air gapped. An extra foot would have made things quieter, but I the low frequency stuff would be audible even if it's very quiet. It's nearly impossible to get really low-freq attenuation without tons and tons of mass. Thick concrete walls would probably work. Or rammed earth, clay, dirt, whatever.

One thing I didn't do is float the inner room on rubber isolation pucks, that's the only thing I can think of (besides building 2 foot thick walls of clay) that would have made it a bit better.

>>1964766
>>>1964583 (OP)
>submerge the box in a dense liquid like water.

Never been swimming huh? Lower frequencies aren't attenuated much in water
Higher frequencies will travel as well if at a sufficient amplitude.

Helium padding does a good job of cancelling out sound. Tech Ingredients has a video on it.

>>1965171
Can I get a non-meme answer. Like a box I can keep my phone inside that muffles noise

>>1965096
That low noise was probably the floor vibrating. I assume you didn't treat floor then or float decoupled flooring over it.
Otherwise what you did was textbook acoustic isolation.

>>1966634
Just turn it off you mongoloid cunt