when you can mesh this bandpass re-location with the Unity design and get 250 hz out of ID full bodies using a PVC connecting pipe and hide your bandpass boxes under the center console, that would be pretty cool...
what, 2 ND91's per side, about 25 bucks in PVC plumbing, and getting 105 db @ 1watt from 250 hz to 18K, maybe it's a pipe dream?
In a Danley SH-25, the woofers sit about 24" forward of the tweeter. The midranges sit about 8" forward of the tweeter.
Part of the 'secret sauce' is that the mids and the woofers are in bandpass enclosures. The bandpass inserts a delay. That's why Danley can get flat phase response, with the woofers nearly two feet in front of the tweeter.
Here's the bandpass box in my car. About two feet in front of the tweeter