Are the high level outputs from the amp crossed over?

[mattkins99]

I think "Crossed Over" is the right term. Audio junkies can correct me. Anyway, I put the basslink in the car right around Christmas and I love it, I just don't want it taking up space so I'm building this box.

http://www.xoutpost.com/electronics/...-included.html

I have a nice small amp laying around that will fit perfectly above the nav computer.... however, it doesn't have a built in crossover. My question is, are the sub wires I tapped into (per instructions from this site, I just can't find the link) already crossed over or is there some sort of passive crossover at each of the speakers?