Another Amp Question

Ok I ran my amp power cables, rca cables and speaker wires. I hooked everything up sucessfully and when I went to mount the amp under the passanger seat I drilled through a whole wireing harness. After cutting the carpet and splicing and taping I got the electrical system back up and running. I also had to replace a couple fuses. I felt like such an ass. But anyway I set the gains and it sounds great. I really don't know how to set the crossover limits. How should this be done. I have an Alpine 250 which delivers 45 watts RMS. I used 4 channels one for each speaker and do not intend on adding Subs. I need to know more about these crossove limits and the correct way of adjusing them. Thanks:banghead: :frown: :screwy:

you have 4 coaxial speakers, 2 in the front doors and 2 in the rear package shelf ?