do you think the crossover in my hu is good enough or should I buy an external one? My hu does have sub outs and seperate speakers rcas so idk. how much of a difference in sq would an external one make?
Zero, if your HU crossover is the frequency you want to use. The advantage of external X-overs is that you can adjust the frequency, where as with the HU it will usually just have a few preset frequencies.