Anyone have any experience comparing the Icon 2 Integrated Desktop Amp vs the older version? Is there any difference in sound quality?   Also, for anyone who has either version, how does the line out work? Specifically, is it volume controlled? Does it cut out when you use the headphone out?  

I've been looking for alternatives as well and so far the only alternatives I've seen are these:   Travagan Red/Green: http://www.head-fi.org/products/travagans-red-headphone-power-amplifier   Glow Audio One: http://www.head-fi.org/products/glow-audio-one   I think for my...