My DIY speakers "J&N"

Discussion in 'DIY Corner - Tips & Techniques' started by jororaitchev, May 17, 2017.

  1. jororaitchev Junior Audioholic

    jororaitchev
    Joined:
    May 17, 2017
    Messages:
    50
    Likes Received:
    54
    Archimedes used the floating force to find out if there is silver in the royal crown.

    I tried to explain to you that the specific resistance of MDF in my measurements is taken in pure weight units and removed from the total weight of the water in the cabinet volume.
    Joro
  2. jororaitchev Junior Audioholic

    jororaitchev
    Joined:
    May 17, 2017
    Messages:
    50
    Likes Received:
    54
    And continue with my "clever trick";
    Let's assume that the density of MDF is 0.75 kg. of cubic decimeter/ average value by tables /. This is 75% of the actual reduced volume.
    The reduced volume error is:
    3.5 / 0.75 = 4.6 liters actual reduced volume, and the whole volume is 43-4.6 = 38.4 liters.
    The total error of 39.6 liters is 1.2 liters or -3.1%.
  3. MrBoat Audioholic General

    MrBoat
    Joined:
    Nov 13, 2016
    Messages:
    1,311
    Likes Received:
    574
    I understand what you are saying, jororaitchev. Initially, I was more concerned with the volume before the enclosures were built during the design and drafting phase. It never occurred to me one would measure after with something like a speaker cabinet. I have seen Archimedes principle applied for displacement, or the volume of solid, irregular shaped objects. I have used Archimedes principle to measure lard for baking to keep from having to pack a measuring cup with the fat.

    In the case of ship building, these volumes are known for the most part, with an adjustment feature built in by way of added or removed ballast perhaps, provided they are relatively close to start with. A ship hull comes from the architect with a designed waterline before the first piece of material is cut. When the boat is launched, it will be stated that she "rests on her lines". . . .hopefully.
  4. MrBoat Audioholic General

    MrBoat
    Joined:
    Nov 13, 2016
    Messages:
    1,311
    Likes Received:
    574
    Dry beans are very settling due to their irregular, smooth shape, their weight and their slippery and hard exterior. You could essentially stir them into place. They also come in a variety of sizes to match scale.

    Ok, I am not totally serious but, it would work in a pinch if one did not want to source or construct something more complicated. I grew up knowing some pretty resourceful thinkers that could make due with whatever was around them with some surprisingly accurate results. Those left/right brain types.

    Dry sand can even be used to measure volume, as it is fluid enough to find it's way through the hourglass.
  5. jororaitchev Junior Audioholic

    jororaitchev
    Joined:
    May 17, 2017
    Messages:
    50
    Likes Received:
    54
    I can now start collecting the cabinet; R-R.jpg R--R.jpg R---R.jpg
    • Like Like x 2
  6. jororaitchev Junior Audioholic

    jororaitchev
    Joined:
    May 17, 2017
    Messages:
    50
    Likes Received:
    54
    I have an idea to make a new project to in the base there should be two 10" loudspeakers - just an idea. They look like animals, maybe dinosaurs, but important are 20Hz. 2.jpg 20.jpg
    • Like Like x 4
  7. KEW Audioholic Spartan

    KEW
    Joined:
    Jul 12, 2009
    Messages:
    6,056
    Likes Received:
    2,140
    Location:
    Jowjah
    You need to raise your ceiling, scale up this model so they tower over you and build the speakers into the abdomen and chest cavities!
    [​IMG]
    KEW,
    • Funny Funny x 2
  8. jororaitchev Junior Audioholic

    jororaitchev
    Joined:
    May 17, 2017
    Messages:
    50
    Likes Received:
    54
    My high ceiling criteria differ from reality,this "Lego" is very good!
    • Like Like x 1
    • Funny Funny x 1
  9. jororaitchev Junior Audioholic

    jororaitchev
    Joined:
    May 17, 2017
    Messages:
    50
    Likes Received:
    54
    And the original model will look like this;
    J&N-001.jpg
    • Like Like x 2
  10. jororaitchev Junior Audioholic

    jororaitchev
    Joined:
    May 17, 2017
    Messages:
    50
    Likes Received:
    54
    I continue with the collection of the cabinet;
    sr.jpg sr-1.jpg
    Now I can make the exact measurement of the volume. And that's 31.5l, just as much as I need!
    Oh, l forget to show you what I did to get that volume!
    I maked a filter compartment (for the MW and TW), the W section will be in the box;
    cap..jpg dyno-cap.jpg cap-dyno.jpg
    I previously make the last layer-10 mm MDF / to get a sandwich construction / on the front panel and the bottom;
    dyno.jpg elo.jpg
    Last constructive action ;
    After 10 hours I will install the last layers of 2 x 4 mm bent MDF;
    final.jpg
    • Like Like x 1
  11. jororaitchev Junior Audioholic

    jororaitchev
    Joined:
    May 17, 2017
    Messages:
    50
    Likes Received:
    54
    A small structural change for the side panels, last layer is 1 x 4 mm plywood and everything is re ady for the measurements.
    stran..jpg
    • Like Like x 1
  12. KEW Audioholic Spartan

    KEW
    Joined:
    Jul 12, 2009
    Messages:
    6,056
    Likes Received:
    2,140
    Location:
    Jowjah
    It a delight just to look at your constructions!
    Woodworking porn FTW!
    KEW,
    • Agree Agree x 1
  13. jororaitchev Junior Audioholic

    jororaitchev
    Joined:
    May 17, 2017
    Messages:
    50
    Likes Received:
    54
    Thanks!
    And a risky picture (everything is supported by gravity), how look for compared to the frontal columns, are not on one line, but I rely on your imagination.
    Sr-st.jpg
    • Like Like x 3
  14. jororaitchev Junior Audioholic

    jororaitchev
    Joined:
    May 17, 2017
    Messages:
    50
    Likes Received:
    54
    Several steps to the moment with measurements ...
    SrSt.jpg SrSt-1.jpg SrST-2.jpg SrSt-3.jpg
    • Like Like x 1
  15. KEW Audioholic Spartan

    KEW
    Joined:
    Jul 12, 2009
    Messages:
    6,056
    Likes Received:
    2,140
    Location:
    Jowjah
    KEW,
  16. jororaitchev Junior Audioholic

    jororaitchev
    Joined:
    May 17, 2017
    Messages:
    50
    Likes Received:
    54
    If we have to associate with the white, it is with the helmets of the warriors of "Star Wars".
    This is the project of the rear speakers, will finish it with "Bird's eye view".
    • Agree Agree x 1

Share This Page

  • RBHsound.com
  • BlueJeansCable.com
  • SVS Sound Subwoofers
  • Experience the Martin Logan Montis
  • CEDIA