OK from left to right:

Set the level to half way. turn it all the way to the left and then to the right so you can find the middle.

Set the Bass EQ all the way left for now.

HPF (High pass Filter) leave it alone

LPF (Low pass) set to the middle.

Xover (crossover) set to the middle position, right now you have it in full pass and I am sure it sounds like azz.

Stereo leave it, your good.

Jeff