Okay, now that I have way too much bass, I need to control the output. I've seen videos of where people have a potentiometer or some type of variable control knob where they can control the volume of the subs only. I can't do this from my HU so I need to wire this somehow, maybe through RCAs before or after my crossover.
x2 on what pedro said... what kind of amp do you have again? cheapest way would be to get a bass knob.
you can get a powerbass EQ..its $30 on sonic electronix...i got one in my car and i like it. plus its basic, so not difficult to use at all