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Thread: Optimal enclosure volume for the 128 H?

  1. #1
    Senior Member Doctor_Electron's Avatar
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    Optimal enclosure volume for the 128 H?

    Would like to build a pair of cabs using my 4412 components in a vertical array. Is there a better internal volume for the 128H than that of the 4412 cabinets? Thanks.

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    Senior Señor boputnam's Avatar
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    As posted elsewhere, try WinISD. As I recall, it has Thiele-Small parameters for the 128H - you need these to get to your answer...
    bo

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    128H boxes

    When I tried the 128H for bass extension comparisons, I used Win ISD,(free) which wonderful program suggested 50.5 liter box tuned in the mid thirties; I tried 65 liters at 32Hz and could not really tell the difference. The program calculates box dimensions and vents, and plots bass rolloff curves, among its many talents. (As I recall, the 116A was the champ for extension, but...) p.s. Other drivers than those in their extensive library (scroll down to JBL) can be added to the calculator by entering ts parameters in NEW own drivers.

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    Senior Member Doctor_Electron's Avatar
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    Sorry, I am running Linux Umbutu due to the lack of a chipset driver / mainboard setup disk for my pair of Dell Dimension 9200's. I will look for a similar app in the Linux repositories. Thanks for your help, regards, -D_E-
    "Why don't you Mine your own Bismuth, so you won't be mining mine?"

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    Good Morning Dr. E from Hood Canal

    WinISD says: Box size 1.78ft3 tuned to 34Hz for about a42 Hz 3dB down point.

    Hope this helps

    Ed
    Sawdust is my co-pilot

  6. #6
    Senior Member turnitdown's Avatar
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    What Ed said...

    I ran it too and came out with the very same numbers. Good luck with the project. And if you use 2.5 cubic feet tuned to 34, you get a 3dB down point of 36Hz with a vent of 4" diameter and 8.65 inches long. What it doesn't tell me is if it's power limited due to Xmax.

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