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Reload Thread: how is this possible.....

  1. #1
    Beatin''s Avatar
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    how is this possible.....

    playing around with WinISD, I graphed out the Ascendant Audio Mayhem 18" D2 sub.

    Fs = 33.2hz
    qms = 6.62
    qes = 0.27
    qts = 0.26
    vas = 148.9L

    In a sealed box 23.3L in volume and a qtc alignment of 0.71, the sub's F3 is 90hz!!! WTF!?

    I know it's a low qts sub and needs a ported box. But in a 226.5L (8 cubic feet max recommended box size) tuned to 35hz, it's pretty much -3db all the way to tuning where it goes back up.

    i don't understand how this beast looking sub can be advertised as having "monsterous deep bass" and "skull cracking upper bass" when it graphs out so poorly.

    Please tell me I'm missing something here.

    All day I'm clippin'
    voltage be dippin'
    I don't give a damn,
    cause my trunk always hittin'!

    creating a proper sound wave. Step one, turn it up until clipping. Step two, done.

  2. 04-05-2013


    no post dumping

  3. #2
    sundownz's Avatar
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    Re: how is this possible.....

    What you are seeing is very typical of a high motor force driver when modeled up in a box program. In-Car response will not be at all like your graph, though... but still, putting that driver in a sealed box is not a great idea

    - Jacob Fuller
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