Join Date: May 2007
Location: Pottsboro, Texas
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The response curves in WinIsd are theoretical and do NOT represent the resultant curve when the box is placed in a closed space indoors. The larger box will generally have less of a peak at the room mode frequencies compared to the smaller box.
Although WinIsd predicts that cone excursion will go out of limit faster in a larger box, the in-room gain will not require as much power to achieve the same spl at lower Hzs and consequently with less power less cone excursion. You DO have to make a educated compromise about the box size no matter what.
You can also achieve SOME degree of acoustical compromise by stuffing a smaller box with pillows or the like, to make the box "appear" larger to the driver.