In a sealed enclosure, for the best and balanced sound quality, you typically want to end up with a 'Qtc' (system 'Q' of woofer and enclosure) of around 0.8 +/- 5%. You will need the woofer's Thiele Small parameters to correctly calculate this.
What kind of woofer gives you a 240% displacement range? Are you sure that you interpreted the recommendations correctly?
David
Earmark Marine
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