(2) Usher 8955a in 60 liters...?

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Im building a 3-way speaker that has 60 liters of available volume for a pair of Usher 8955a drivers. They will be playing about 350hz and down, sharing the airspace. Would it be better to (and why)...

1: Go vented with a smaller airspace, and tune 60L, 30hz
2: Go sealed with a 60L airspace, Qtc 0.61
3: Go sealed with a 40L airspace (add mass), Qtc 0.71


Thanks
 
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