Prototyping TL design: hint needed

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Hi all,
I've built a pair of Transflex subwoofers tuned at 40Hz.

This resonant loading has a non-linear freq response...something like the one in attachment.
I was wondering if I can solve this in some way...I was thinking about a bass reflex resonator at 2/3 of the lenght (so 60Hz) tuned at 60Hz...or simply a hole will do the work? Does it have sense? Could work?
I've also thought about shaping the last 1/3 of the lenght like a Karlsons' enclosure...what about this solution?

Any other idea?
 

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  • Freq-response.JPG
    Freq-response.JPG
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  • 2wqwtl.JPG
    2wqwtl.JPG
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