Disadvantage for place the Fostex 168e sigma into Fostex 166e BLH enclosure ?

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Hi ALL

I would like to build a BLH speaker.

I did not have sufficient tools and places for it.

but I just found the yahoo in my place has 1 set of Fostex FE166en cutted woods.

however, in my country. the prize of FE166en and FE168e sigma are close.

I have check the size, the FE166en enclosure can place the FE168e sigma.

but It seems that the datas are so different. Is the chamber design from FE166e has significant disadvantage ?

FE166en FE168e sigma
Qms 3.426 5.328
Qes 0.226 0.27
Qts 0.25 0.26
Vas 37.2L 23.7L

I would like to ask for suggestions to stay FE166en or replace it with FE168e sigma.

Thanks for your comment
 
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