That's some very interesting feedback from you about your final preference.
The crossover is a bunch of parts in the speaker that act as a steering system for frequencies. Highs go the tweeter and the lows go elsewhere like a mid-woofer and/or a woofer. The crossover can also be used to fix misbehavior of the driver.
The devil is in the hand-off between one driver and another. Another devil is performance of the cross-over under high power.
You can't possibly know if a crossover is good or bad by looking at it. You also can't know by doing math. You have to do tests like Axiom does by spinning the speaker around and taking measurements. You start by doing some math to get the parts close to target and then iterate by measuring and tweaking the parts. When you think you've got it right, you do some listening. And you might need to tweak some more. Sometimes, you might have to build multiple flavors of crossovers, listen to each one and decide what you think your market likes best. That becomes the reference design that goes to production.
Then you get the speaker and phuk things up by swapping a v4 tweeter with a ti.
