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Thread: The Black Hole

  1. #1
    Join Date
    Oct 2006
    Location
    Tokyo Japan
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    15,807

    The Black Hole

    So I'm finishing up the Studio Build and one of the things that was added to the list was trying to quiet the AC vent into the room. It is NOISY and in this small soundproof room, it was not very pleasant. The AC system is old, and seems to have two speeds, too low and too high.



    The vent in question.





    With the vent removed.

    Hard to see but there is a flap up in there behind the sort of louvers that controls how much air can pass through the hold, this is the main source of noise as well as the white vent cover.

    I want to kill the sound but retain the air flow, so my answer is to make the sound change directions but provide enough volume for the air flow to be not significantly reduced.



    I had to make up the metal cylinder that attaches to the metal box in the ceiling, you can see the existing vent on the left and the piece I made to do the same job on the right, this just has the one flat panel that will go tight against the ceiling for now.


    Here is the basic idea.....



    The "W" shaped bit is the bottom the "U" shaped bit fits over it and has the inlet pipe in the middle of it.


    Here it is together, it is upside down on the bench here.

    The idea is that the sound will hit the middle of the W and go to each side, then it will hit the lip or outer edges of the W and again be forced to change direction. The inside of the unit will be covered with sound absorbing foam.



    Here is the unit before it is put together.



    Installed.

    Did it work...?

    Yeah I think so, their is a noticeable reduction in noise, with my iPhone decibel measuring app on my iPhone from 1 meter away it was a steady 72 dB, after the install it has dropped to 59dB, that is a big difference.

    Cheers!
    Last edited by Stuart Ablett; 03-24-2015 at 12:26 PM.
    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
    William Arthur Ward

  2. #2
    Join Date
    Nov 2006
    Location
    Austin, Texas
    Posts
    1,448
    So now in addition to everything else, you are an acoustic engineer. Amazing.
    Charlie Plesums, Austin Texas
    (Retired early to become a custom furnituremaker)
    Lots of my free advice at www.solowoodworker.com

  3. #3
    Join Date
    Nov 2006
    Location
    Delton, Michigan
    Posts
    17,472
    good fix stu,, so now you need to start looking at medicine and see if you can improve on some things in that field
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  4. #4
    Join Date
    Feb 2012
    Location
    St. Catharines, Ontario, Canada
    Posts
    2,749
    Good solution to the problem, Stu. I would have just turned off the a/c when anyone was in the room.
    Cheers,
    Roger


    The other member of Mensa, but not the NRA

    Everyone is a self-made person.

    "The thing about quotes on the internet is that you cannot confirm their veracity" -Abraham Lincoln

  5. #5
    Join Date
    Oct 2006
    Location
    Tokyo Japan
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    15,807
    Quote Originally Posted by Roger Tulk View Post
    Good solution to the problem, Stu. I would have just turned off the a/c when anyone was in the room.
    Well with 8 people in a room that small for four hours or so, that could get a little......close...
    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
    William Arthur Ward

  6. #6
    Join Date
    Dec 2007
    Location
    Billings Missouri near Springfield Mo
    Posts
    4,552
    Nice fix Stu they should be happy with that....
    A Turn N Time
    Components for John Smith Organs and the Hobby Organ Builder

    Frog Pond Guitars


    Before you criticize someone, you should walk a mile in their shoes. That way, when you criticize them, you're a mile away and you have their shoes.

  7. #7
    Join Date
    Jun 2008
    Location
    GTA Ontario Canada
    Posts
    12,251
    Very clever fix Stu. They going to love you at that place.

    Sent from my SGH-I337M using Tapatalk
    cheers

  8. #8
    Join Date
    Oct 2006
    Location
    Tokyo Japan
    Posts
    15,807
    Thanks all.

    They used the Studio last night and reported back to me that it went well, the noise was nothing that bothered anyone, so I'll call that one a success too.
    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
    William Arthur Ward

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