I was immediately impressed by the Clarity and Tightness of the system as a whole .No more wheezing or flapping at loud volumes.While you do have to run more volume at the rig because it is now 4Ohm's not 2Ohm's its not double,I would say a third more . The mid bass is MUCH improved and the Sub Bass although not as powerful/ boomy it is supper tight and mixes very well with the doors. After listening I was disturbed by the shrillness and non focused sound stage the factory tweeters added to the mix so I disconnected them and I must say I don't miss them at all. It still SOUNDS like there there but its the doors taking up the slack and sound stage is much better defined with them gone. As for the whole IN Phase/Out of Phase Sub thing the verdict is still out for me . They Sound DIFFERENT out of phase, not necessarily better. OUT of phase seems more MID and TIGHTER while IN phase seems more BOOMY at least to me. I will listen for a while and see what I think after a week or two. Anyway that is my experience with the whole deal Hope it helps some one , your experience of course may vary.