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Thread: Example Cabinet for the Great Plains Audio 604-8H-III unit

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    Senior Hostboard Member VolvoHeretic's Avatar
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    Re: Example Cabinet for the Great Plains Audio 604-8H-III un

    Didn't I read somewhere that the driver should be something like 1/3 down from the top? and if so with a known front baffle width and 38" speaker placement, it should be easy to figure out height and depth?
    "James, a little knowledge is a dangerous thing!" World's scariest Volvo: [url]http://www.youtube.com/watch?v=AKn-LTNa4rc[/url]

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    Re: Example Cabinet for the Great Plains Audio 604-8H-III un

    Quote Originally Posted by VolvoHeretic View Post
    Didn't I read somewhere that the driver should be something like 1/3 down from the top? and if so with a known front baffle width and 38" speaker placement, it should be easy to figure out height and depth?
    Correct, the two specific offset driver dims are L*0.21 for 1/4 WL and L*0.349 for 1/3 WL, but in general for smoothest overall performance, both it and the vent should be at an odd harmonic, though as shown for the 1/3, the vent shifts it down some, but once damped, there's no audible difference between them and frankly, I always recommend L*0.4 when appropriate as it makes the cab taller, ergo more vent damping. When I do certain designs, I use a proprietary formula that takes all three dims into account to reduce the amount of damping to a minimum, to the point where so many folks were removing most of it that I quit recommending any, just 'damp to taste'.

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    Re: Example Cabinet for the Great Plains Audio 604-8H-III un

    Assuming the height of the Stonehenge III is 44" from post #4, and scaling this photo of the Stonehenge I, III, and V from this website: GPA 64-8H-II - Audio verleden - High-End Forums I come up with a height of 49" for the Stonehenge V, and it would appear that the front baffle is the same width as the III.
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