No one else in this area? Wow, where did all the wire is wire guys go?
Free demo with chance to learn something....
Danny,
I think you might have gotten a much better participation in this "experiment" if you hadn't set such a condescending tone with the title and premise of the thread. Calling (some) folks "nay-sayers, and flat-earthers" and doing so with an instructors tone is just not appropriate.
What we have here is a simple box speaker (with all its inherent problems) with two crossovers set for the exact same transfer functions. Before I even listened to the speakers I verified that aspect of the experiment by measuring the electrical transfer functions directly at the driver terminals. (Unfortunately, I had to repair both speakers before I could even do that.)

There is a slight difference in the woofer transfer functions, but not enough to really worry about.
Anyways, the listening tests didn't take me long. I didn't like the sound of the speakers with either crossover engaged so I quickly lost interest and re-boxed them.

That being said, it wasn't difficult to hear minor audible differences between the two crossovers. Which one I "preferred" is not really relevant and I wouldn't want to influence any future auditioners.
One suggestion I do have for future auditioners is to make sure you have an assistant do the switching so you (the listener) has no knowledge of which crossover is being utilized.
The concept of the test, I guess, is a valid one, if the implementation is done correctly (which Danny did.) However, the conclusion may be somewhat "gray" if a person is determined to hear what he/she wants to hear.
Thank you for taking the time to modify the Behringer speakers and thanks for giving me a phone call to check up on my progress. Unfortunately, I think the primary thing to be "learned" here is how disappointing the sound of box speakers can be.

Cheers,
Dave.