for me it really improved the rear sound image. I never have anyone in the back seat. My only complaint is the driver"s head rest actually blocks some of the sound from the left side rear. My daughter commented yesterday about how it really feels like you are inside the music, she is 22 and had never been in a car with good rear sound.For the rear deck, having a 2-way setup with the tweeters mounted in the corner...will that have a harsh sound or will it give the rear more spatial sound? I really don't have people in the back that much, so really not an issue I guess.