It's funny you replied to this today, I just ordered parts to make a crossover. I believe these are first order crossovers, 6db/octave? I'm going to go with second order, 12db/octave. They have a capacitor and inductor. Building a crossover can be extremely complicated, and I know just enough to be dangerous.

I have a DBX Driverack now, so I can control everything. My ear can't hear a difference when I make major changes. If I change the woofer and mid to roll off early, or run flat out, I can't tell.