I just upgraded the E7 to the E17 to drive my HD650 when I am mobile in the house and appreciate the difference. In fact I think the soundstage is better and more airier without the E9. I wondered whether you agree using the E09K or perhaps am I using the wrong set up - currently E17 on lo passthough with E9 on high gain? I am starting to think its time to get rid of the E9 and opt for something more? But then again my budget is tight.