crossover..
it shoudl have an input..RCAs
the output of the headunit goes there..
then your crossovers out...thats where you hook up your amps..
you should have high freq outs and low freq outs..(thats the regular crossover)
you gonna need 2 amps or more.., or, it depends on your application..
you should have a regular positive/negative/remote ..
after that...you should be able to tune your highs and lows seperately..
goodluck..
dont **** it up