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ISO El-Cheapo

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  • ISO El-Cheapo

    Original Build Thread
    Self Hosted Write-up
    Project Gallery

    Design Goals

    Cheap with good bass extension fitting into the existing 1 cubic foot cabinet. In order to minimize cabinet size, the drivers are to be used isobaric loaded in a face to face clamshell mount. This arrangement allows inexpensive woofers to play deep in small spaces where a higher end, higher power woofer would usually be required.

    Driver Selection

    The GRS 10SW-4 woofers had similar parameters to the original Pyle speakers and modeled fairly well in the small existing enclosure. And at only $20 each, allowed a re-build with only $40 in drivers.
    Last edited by wogg; 05-31-2017, 04:36 PM.
    Electronics engineer, woofer enthusiast, and musician.
    Wogg Music

  • #2
    Enclosure Design

    The resulting response in the 1 cubic foot box reaches 34Hz at -3dB with a peak between 60 and 70 Hz. This is improved with the increased volume, resulting in a 27Hz F3 and a reduced response peak around 50Hz.

    Both designs allow the drivers to use all 240W of input power without over excursion and approximately 107dB peak output.
    Enclosure Assembly

    Nothing special here. The original enclosure was assembled with external screws and dado joints, using wood putty to hide the screws. This was sanded a bit and cleaned up using some more putty and finished with Duratex.
    Electronics engineer, woofer enthusiast, and musician.
    Wogg Music


    • #3
      Tips and Tricks

      The drivers are mounted face to face directly against their gaskets. The gasketing was sufficiently thick to avoid the driver surrounds touching and ensures a clean seal with minimal air space between the cones for maximum isobaric efficiency. I used pocket screws for the mounting of the clamshell because they were the appropriate length, course thread, and color.


      In the 1 cubic foot design, this subwoofer does really well in an automotive installation. The combination of cabin gain, and masking of noise by way of trunk mounting really covers up the less than ideal peak in response and the chuffing from the undersized and poor clearance port.

      Electronics engineer, woofer enthusiast, and musician.
      Wogg Music


      • #4
        I'm a fan of exposed drivers, I've done something similar a few times, driver out I mean.
        *Veneering curves, seams, using heat-lock iron on method *Trimming veneer & tips *Curved Sides glue-up video
        *Part 2 *Gluing multiple curved laminations of HDF *Cello's Speaker Project Page

        *Building the "Micro-B 2.1 Plate Amplifier -- Part 1 * Part 2 * Part 3 * Part 4 * * Part 5 'Review' * -- Assembly Instructions PDF


        • #5
          Nice build. I may have to try this
          All about Speaker Design YouTube Channel


          • #6
            Great Build!!! I would love to see a 12" version. I think these value builds are a great way to people started into diy .