Boss tanung lang, need pa ba ng e-crossover kahit may built-in na amplifier ko, dako satisfied sa quality ng audio set up ko, im using 2din AVM, sub jbl-s12 at sa front door naman GT5-502 plus tweeter GTO18T and stock speaker naman sa likod. Im using AM1850d lightning lab at x12 ampli naman sa speakers. D ako satisfied sa quality. Hindi kaya sa head unit problema ko, any suggestion? Tia