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thxgoon wrote:
 though if tuned much above 17hz group delay can enter the audible realm |
Please refer me to the perceptual research, that meets proper scientific protocols, that shows significant audibility. In lack of specific research that I could find, I have produced careful simulations, and used ABX methodology on myself and several others. The conclusion being, the group delay introduced by a normal ported design target function is not of any audible significance.
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3. Sealed. The simplest design. All of the above issues become a moot point at the expense of 6 db of output down low. According to a model earlier this would still result in 114db at 20hz anachoic and last I checked this is pretty awesome.
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Under what conditions can one achieve 114db at 1M free field/2M ground plane, around 20Hz, using the JLW7 in a sealed configuration? The Fathom 13" unit is an excellent example - and it can not approach this SPL at that frequency. Nor do my sealed models agree that such a SPL is probable.
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tpaxadpom - I looked at the pro wedge you were considering. The box looks awfully small to me for a home theater application. With smaller volume you increase the system Q value which leads to extremely high transient response at the expense of extension and efficiency. I think you'd find it to be a bit boomy.
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You could use parametric equalization to counter the small enclosure response - and remove the peak due to high QTC.
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Anyone have access to WinISD to run some quick numbers for a sealed enclosure for .707? If you don't mind building your own the MDF can be had for less than the cost of the Pro Wedge and would yield better results IMHO. Let us know what you're thinking.
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For a QTC of 0.707, a volume of approximately 4.1 ft^3 would be required.
-Chris