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Quick cheap box; 600 litre volume

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  1. #1
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    Default Quick cheap box; 600 litre volume

    I need to make a box with an approximate volume of between 550 and 600 litres.
    Using precut panels from Bunnings using the 600 * 1800 sheets of 12mm chipboard will give me about that volume.
    https://www.bunnings.com.au/1800-x-6...dyman_p0430926
    But I have my doubts about my ability the get this box straight and true.
    I have thought about using some steel angle brace brackets to help.
    https://www.bunnings.com.au/zenith-7...-pack_p3972135
    Any easy methods for doing this reasonably quickly without spending too much money?
    My table isn't a full 1800 long but it's close and it is reasonably flat and true
    I'd buy another of these roofers squares if that would assist.

    https://www.bunnings.com.au/empire-1...-blue_p0154654

    It's a speaker project using an 18inch woofer I picked up cheap last month, testing with a S/H woofer before making a decision on buying new
    "A big boy did it and ran away"

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  2. #2
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    If your using the full sheets then they are usually pretty good tolerance wise, once you start screwing it together it will all stiffen up. I dont see the brackets will add value, strength or improve alignment.

    Personally would use MDF for the extra density, and at 12mm and that size it will not provide enough rigidity for proper testing of a sub woofer.

  3. #3
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    If the box design works as per the simulation I'd glue MDF panels to the chipboard internally, I have some long narrow scraps of stuff here. I'd not loose too much volume using 6mm MDF.
    It is more a design test than a real box at this stage.
    If the brackets won't add much I'll save the money and use it to buy more PVA.
    Here's a picture of the first test box made up from all the scraps in the shed with a graph of the simulated response. As made it's a one note DOOF-DOOF sub and not what I usually make.
    155 litre internal volume
    Then a graph of the box I want to make which digs much deeper but is 4 times the volumegeneric-18-woofer.jpgimg_2420.jpgbig-box-18.jpg
    That hump at the kick drum frequency makes for good "Thump" but isn't musical at all, the bigger box will be better
    "A big boy did it and ran away"

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  4. #4
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    Where is such a giant subwoofer box going to live? Why so big?
    Never argue with idiots, they will drag you down to their level and beat you with experience.


  5. #5
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    I wound up buying the steel brackets. I am using them as clamping guides while the Titebond sets.
    I started with the top end and can't put the sides on yet
    "A big boy did it and ran away"

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  6. #6
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    Quote Originally Posted by Whitey66 View Post
    Where is such a giant subwoofer box going to live? Why so big?
    In the shed.
    This is the size it needs to be to give deep bass from this cheap Pro driver without that horrible peaky "BOOM"
    Here's a link to the driver in question
    https://www.ebay.com.au/itm/15280513...3ABFBMjKjO05Vh
    "A big boy did it and ran away"

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  7. #7
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    Here are some quick pix of the work in progress.
    Just in case there was any interest
    I'm spending a good bit of time waiting for glue to dry so I can turn the box over to do the MDF adjunct panels.
    Another trip to the Big Green Shed for even more 42*19s tomorrow
    Attached Thumbnails Attached Thumbnails img_2428.jpg   img_2427.jpg   img_2426.jpg   img_2425.jpg   img_2423.jpg  

    img_2422.jpg   img_2421.jpg  
    "A big boy did it and ran away"

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  8. #8
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    The cost of wood and glue is crazy at the moment, this "cheap" box has already cost me over $200-
    "A big boy did it and ran away"

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  9. #9
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    Moondog testing his new speaker - https://www.youtube.com/watch?v=R5pa...annel=roflcake
    Never argue with idiots, they will drag you down to their level and beat you with experience.


  10. #10
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  11. #11
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    A bit more work on the box in between housework and gardening.
    Cannot keep up with the weed growth at the moment.
    May be another week before I get around to the baffle and installing a dozen T-nutsimg_2447.jpgimg_2446.jpgimg_2442.jpg
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  12. #12
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    Great job!!
    Your neighbours are gunna hate you
    Never argue with idiots, they will drag you down to their level and beat you with experience.


  13. #13
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    I'll just invite them all to the party.

    Seriously tho I didn't think I'd need this much wood inside the box but experts over at the DIY audio site kept telling me I didn't have enough bracing.
    I still need to modify the vent area a bit to lower the tuning a few Hertz tho.
    "A big boy did it and ran away"

    Legal disclaimer denying responsibility to be inserted here.

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