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Thread: It is really quiet tonight :)

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    Default It is really quiet tonight :)

    Taking some, after midnight, noise measurements in the hemi-anechoic chamber. I can say it is very quiet...

    LAF: A-weighted, Fast
    LCF: C-weighted, Fast

    Equipment:
    Bruel & Kjaer 2250-L G4 Sound Analyzer
    Bruel & Kjaer Type 4955-A MIC

    The screenshot below depicts the noise floor of course.



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    That is a damn quiet room.

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    Default

    black friday

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    crmaris (11-24-2018), Jon Gerow (11-24-2018), Orion (11-24-2018)

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    How big is the difference if you're present in the room and breathe quietly?

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    Quote Originally Posted by Orion View Post
    How big is the difference if you're present in the room and breathe quietly?
    Nominally that is 30 bB. My "silent" basement is 31 dBA. To get significantly less than 30 dB, you have to have an echo-reducing apparatus like his.
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    you can get below 30dBA if you have a proper sound analyzer and a mic, but this will cost you 5-6k the least. My mic alone costs more than 4.5k and the sound analyzer around 7-8k.
    The affordable sound analyzers have a noise floor of 30 dBA because of their electronics noise. This doesn't mean that you cannot get below that into a silent room. Getting below 20 dBA is very hard though for a proper room and going below 10 dBA is challenging even for proper hemi-anechoic chambers. Thankfully I leave in a peaceful (during the night at least) village.

    With me in the room I cannot go below 10 dB(A) or even 12 at some cases, so I have to remotely control everything. Since I built the chamber from the scratch for this purpose alone (there are no windows or ventilation holes and the door weights around 350 kilos and it is specially designed) I installed cables for ethernet so I have a way to communicate with the internal's of the chamber. WiFi signal cannot pass, since the walls are about 40cm thick and the top is also 40cm of pure concrete.

    If there is a war here (hopefully never!) I can also use this room as a bunker.

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    So impressive!

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    Quote Originally Posted by crmaris View Post
    you can get below 30dBA if you have a proper sound analyzer and a mic, but this will cost you 5-6k the least. My mic alone costs more than 4.5k and the sound analyzer around 7-8k.
    The affordable sound analyzers have a noise floor of 30 dBA because of their electronics noise. This doesn't mean that you cannot get below that into a silent room. Getting below 20 dBA is very hard though for a proper room and going below 10 dBA is challenging even for proper hemi-anechoic chambers. Thankfully I leave in a peaceful (during the night at least) village.

    With me in the room I cannot go below 10 dB(A) or even 12 at some cases, so I have to remotely control everything. Since I built the chamber from the scratch for this purpose alone (there are no windows or ventilation holes and the door weights around 350 kilos and it is specially designed) I installed cables for ethernet so I have a way to communicate with the internal's of the chamber. WiFi signal cannot pass, since the walls are about 40cm thick and the top is also 40cm of pure concrete.

    If there is a war here (hopefully never!) I can also use this room as a bunker.
    So he spent $12.5K on equipment alone. For most of us the room would be about $8K. Figure $20K for the whole setup.

    CRMaris told me what equipment he used. When I saw how much it cost (even back then) to replicate what he had, I decided to stick with my quiet basement and the el-cheapo SPL meter I was using.

    Hats off. I doubt even fan labs surpass that setup. Equal maybe. Surpass? I'd be surprised.
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    Quote Originally Posted by ehume View Post
    So he spent $12.5K on equipment alone. For most of us the room would be about $8K. Figure $20K for the whole setup.

    CRMaris told me what equipment he used. When I saw how much it cost (even back then) to replicate what he had, I decided to stick with my quiet basement and the el-cheapo SPL meter I was using.

    Hats off. I doubt even fan labs surpass that setup. Equal maybe. Surpass? I'd be surprised.



    Most "labs" for fan OEMs go down to ~20dB unless you're one of the Silence guys like Noctua or BeQuiet who put more effort into that sorta thing.



    You could actually get your basement's noise floor down to 20dBA if you're willing to build an isolation box. It's really about building out layers and just making sure everything is sealed tight.

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    Quote Originally Posted by Tator Tot View Post
    Most "labs" for fan OEMs go down to ~20dB unless you're one of the Silence guys like Noctua or BeQuiet who put more effort into that sorta thing.



    You could actually get your basement's noise floor down to 20dBA if you're willing to build an isolation box. It's really about building out layers and just making sure everything is sealed tight.
    By the time I got to reviewing I was too old to build an isolation box -- plus there was the tiny issue of finding room for it, and a fan box that did not reverberate. You can go nuts in pursuit of silence.
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