3rdAct Posted July 29, 2018 Share Posted July 29, 2018 I came across this... Microsoft built an anechoic chamber that reached -20.6 dB background noise level, setting the world record in 2015. There's this ... [video:youtube] And for a little easy reading... BBC News article ---"It gets close to the limit of what should be possible to achieve without creating a vacuum the noise produced by air molecules colliding with each other at room temperature is estimated to be about -24 decibels." ---"The chamber sits at the heart of six concrete onion layers that help to block out sounds from the outside world. This nest of rooms within rooms each with walls up to 12 inches thick..." ---"The chamber itself floats on top of 68 vibration damping springs mounted on its own separate foundation slab." Apparently, Microsoft uses it to check the noise made by components on computers and other devices, to test voice recognition, etc. Seems a little excessive, but what do I know?! Link to comment Share on other sites More sharing options...
MoodyBluesKeys Posted July 29, 2018 Share Posted July 29, 2018 Even without a vacuum, it should be possible (although rather difficult) to reduce the noise floor by lowering the temperature of the air molecules. It is likely that there is still enough pass through from external noise sources that either vacuum or low temperature would not be the limiting source. Howard Grand|Hamm SK1-73|Kurz PC2|PC2X|PC3|PC3X|PC361; QSC K10's HP DAW|Epi Les Paul & LP 5-str bass|iPad mini2 "Now faith is the substance of things hoped for, the evidence of things not seen." Jim Link to comment Share on other sites More sharing options...
Gary75 Posted July 29, 2018 Share Posted July 29, 2018 Imagine the sound of your tinnitus in such a chamber, plus of course all the voices in your head. Link to comment Share on other sites More sharing options...
Markyboard Posted July 29, 2018 Share Posted July 29, 2018 I wonder if a tree ever fell in that chamber. :idk Link to comment Share on other sites More sharing options...
TheFunkman Posted July 29, 2018 Share Posted July 29, 2018 ElectroVoice has one of these in the Minneapolis area, but as your ears adjust, you eventually start hearing sounds conducting through the walls. Still a worthwhile experience, though ... "If more of us valued food, cheer and song above hoarded gold, it would be a merrier world." - J. R. R. Tolkien Link to comment Share on other sites More sharing options...
MAJUSCULE Posted July 29, 2018 Share Posted July 29, 2018 Imagine the sound of your tinnitus in such a chamber, plus of course all the voices in your head. It's definitely dangerous to stay in a space like this for any extended period of time. Torturous, really. Eric Website Gear page Link to comment Share on other sites More sharing options...
3rdAct Posted July 29, 2018 Author Share Posted July 29, 2018 ElectroVoice has one of these in the Minneapolis area, but as your ears adjust, you eventually start hearing sounds conducting through the walls. Still a worthwhile experience, though ... The article states that the anechoic chamber at Orfield Laboratories in Minneapolis held the previous record of -9.4 dB. Is this the same place? Link to comment Share on other sites More sharing options...
3rdAct Posted July 29, 2018 Author Share Posted July 29, 2018 Imagine the sound of your tinnitus in such a chamber, plus of course all the voices in your head. It's definitely dangerous to stay in a space like this for any extended period of time. Torturous, really. Yes, and imagine doing it with no visual stimulus either! I just looked at the description for the anechoic chamber at Orfield Laboratories in Minneapolis (mentioned above), and they say they have a program to allow the journalists of major media the opportunity to experience their anechoic chamber by allowing them to silently spend 45 minutes in the chamber with no lights and no sound so that they can report on the experience to their readership. Link to comment Share on other sites More sharing options...
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