It definately allows for better settings if your unit has built in crossover etc. One thing to look out for is overall volume though. My head unit doesn't send out as much juice from the pre outs as the stock unit so maximum volume is much lower. This is not that big of a deal as at full volume there is no/minimal distortion but sometime I wish I could get it just a bit louder. SQ is way up though, being able to clip the bass down on the door speakers makes a world of difference. Also reduces all that rattle from the door handle and speaker surrounds for the most part.