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WmAx wrote:
 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. |
This was based on a previous post where a
PR design was reported to have 120db output at 20hz. I thought it sounded a bit extreme as well but I have no personal experience with this driver and have not had a chance to model it.
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You could use parametric equalization to counter the small enclosure response - and remove the peak due to high QTC.
For a QTC of 0.707, a volume of approximately 4.1 ft^3 would be required.
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There's 2 great ideas for a sealed enclosure. The Porwedge/EQ option would require more power. Man, 4 cubic feet is not bad. tpaxadpom if you try this I would be extrememly interested in your results!