I've been thinking about making a 3-way system, maybe a cheap one to practice with for now... before I try something reckless and expensive. So I'm wondering, when people choose drivers that 'work well' with each other, how do you know they work well with each other? I'm tempted to say that getting all the drivers with the same brand name might contribute to it, but then again, I know very little in the subject. Frequency response and I'm guessing sensitivity play a role, but what other kind of specs should I be looking for?