how much superior? it's like listening to something thru a doorway with the door openned half way, compared to the wall and door being removed. it sounded really really great and direct without limits with the 108, then goes to another level with the 458's. it's more an experiential thing in where the 458's take you.Thanks for the reply Mike. I was afraid you were going to say that. :-) Back to the drawing board ... Hmm!