How to configure the speakers and crossover on the str-da50es/JBL120SCSI

[Eurico]

I have a str-da50es receiver and a JBL 120 SCSI System, and i dont know how i configure the crossover of each speaker. How can i do it?Each frequencie does the front speakers work? and the surround and center? in my receiver is a regulation frequencie to bass, mid and treble for each speaker.
Whats your option about JBL E60? Is it good?

Greetings,

Eurico