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What impact will a slightly smaller box have?

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  • What impact will a slightly smaller box have?

    Greetings,

    It has been awhile since I've built anything and I'm getting the bug again. I'm more of an assembler than a builder because I don't have a shop in which I can build cabinets. So, I'm looking at Paul Carmody's Carrera design. Paul calls for a vented 15 liter box. PE sells a curved wall 0.5 cu ft box that nets out at 14L internal volume. The front baffle dimension is also 1/2 inch wider.

    Can any of you more knowledgeable folks tell me what, if any, impact this might have on the design?

    Thank you.

  • #2
    Originally posted by ozob View Post
    Greetings,

    It has been awhile since I've built anything and I'm getting the bug again. I'm more of an assembler than a builder because I don't have a shop in which I can build cabinets. So, I'm looking at Paul Carmody's Carrera design. Paul calls for a vented 15 liter box. PE sells a curved wall 0.5 cu ft box that nets out at 14L internal volume. The front baffle dimension is also 1/2 inch wider.

    Can any of you more knowledgeable folks tell me what, if any, impact this might have on the design?

    Thank you.
    Some will make a tempest in a teapot out of it, but it will make very little difference once in their location. You are talking small (6%) changenin volume and the varaition in the driver can be greater than that.

    The width will change the BSC/diffraction a bit, but unless you are a foot from the speakers, the environment and HRTFs wll eat that up.

    I would proceed.
    Facebook Page - Ocean State Acoustics

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    • #3
      I agree w/mike.
      Since your box IS slightly smaller (and Paul gives a range of tunings), adding an extra inch should keep the tuning a bit closer to advertised.

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      • #4
        I've used the DATS system to determine the TS parameters for a number of drivers and find that there can be a significant difference between the published values and the ones I determine. And Ray Alden in "Speaker Building 201" states "there is general accord that a 20% variation in Vas will not have a serious effect......." So I'd guess you'd be fine with this small change in volume. Using the DATS to measure your drivers might even find that 14L is the correct size!

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        • #5
          Thank you very much for your comments.

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          • #6
            You can build it in that cabinet no problem. Should look great!
            Isn't it about time we started answering rhetorical questions?

            Paul Carmody's DIY Audio Projects
            Twitter: @undefinition1

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            • #7
              Thanks Paul. Going to give it a go.

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