BIB simulation

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Hi,
I was wondering if any of you guys have experience in simulating BIB's?
What I am thinking about is a two way speaker with a fairly high sensetivity 8inch mid woofer paired with a dome in waveguide in a small sealed enclosure for good control of cone movement and a pro 10inch woofer in a BIB enclosure to suplement below say 150hz.

So in reality a 2.5 system. These 10inch pro woofers have parameters making them managable, with a typical fs 55-60hz, vas 25 - 45litres and qts of 0.25 - 0,35.

But difficult to predict the actual response below 100 hz of the BIB. How much gain can someone expect from a BIB?
 
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