Thiel Owners

Seems to me that an outboard crossover might make the most sense.

I agree. Outboard has lots of advantages. But I also want a significant upgrade that doesn't require the outboard box. I'm able to get a considerable inboard advance over stock. Outboard is better.

Agreed upon. When going outboard with a Dunlavy modified crossover there was a gain in performance even more so when placed on a resonance grounding platform. Not a so called isolation platform as those trap and slow burn the exit of resonance. You want a nice quiet exit thru reactive materials with the proper conductive geometry as a tour guide to the exit. TomD

The floor interface is a complex problem, especially considering that each floor is unique and sometimes substantially different from other floors.

There is a method of material coupling where the collection of resonant energy is transferred to a large disc of the same material effectively increasing the surface area many times. And if you have 3 or 4 these devices then you effectively have the same shelf or floor surface under each and every component set up this way including the speakers. It works. TomD