Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks?

Soooo, it is finally in the system. The driver has been shelved for years, so I expect it will burn in again. The amp driving it is underpowered. So will clock some hours of burn in and will improve the amplification before I can seriously describe and review it

So far, though, it's already a great success. I let the AV receiver do its Audyssey autoEQ thing to integrate the BiB. My daughters and my wife did not immediately notice anything different, but commented that the music suddenly had more rhythm and drive. I can't phrase it any better, actually.

Looking forward to some more burn in and more amplifier power! And some frequency response measurements.
 
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I have been slowly chipping away at this threat, very informative.
I was looking for some guidance on choosing an fs for a build. I'm planning on using the Dayton Audio PS-180 6.5" FR driver.
Fs 58.5
Vas 28L
Qts. .33

I did a practice run BIB build with a Visaton FR-10
Fs 90
Vas 2.29
Qts .67
I was very suprised and pleased with the amount of bass, and the width of the range. So I decided to build a bigger one with a higher quality driver to use as my main listening speakers.
Back to the Daytons, I have seen it suggested here that tuning below fs is a good idea in some situations, I'm wanting to tune this as low as I can while keeping the wide base range. How low would someone with a few builds under their belt suggest pushing the limit. I'm looking at an fs in the range of 48- 58.5 Hz.
A few things;
I have been doing the dimentional calculations witht the BIB Calculator Ver. 2
My ceiling is way to high to load off of ( 18+ feet)
Frequency range of driver per Dayton website is 48-25k
48 hz is the lowest I can go while leaving room for the back of the driver to clear the center divider

What might be the pros and cons of an fs choice in the 48-58.5 range,
Thanks