Honestly I'd have to disagree with John. I have a Yammie 2500 and an HK 635 and I can tell the difference between the two. John insists that receivers don't change the sound, but I think he's confusing receivers with wires.

I've never used separates, so I can't comment on how much of a difference you could expect by going that route. I was considering it, but I decided to hold off. I'm certainly not missing anything by not having them. I can play the music as loud as I want and louder-I'm really only limited by the neighbors.