plans for manifold 2x15 or D&B B2 style

hello everyone, I need a design for a nice powerful double 15 sub, I was thinking of a manifold or band pass hybrid type b2 design but with 15" but I can't find anything, can you help me?
I listened to the 18 nanifold eighteen sound project and a copy of b2 With 18nbx100 and they sounded like I like, I just need them to go down a few db less 🙂
currently I used the woofers on a bandpass design similar to fbt subline / maxx10sa and on tham 15. the bandpass design seemed stronger to me at outdoor parties using 15hp1060 3 15nbx100 cut at 100hz, but I would like something more!

there are these on youtube but will they work?

thanks
 
"I just need them to go down a few db less"

I think you meant hertz instead of dB's.

10ft TH.
Throat = 6" high x 18.25" wide.
Mouth = 13" high x 18.25" wide.

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