I am now rocking the Grado RS-1i headphones with an outboard amp by ALO Audio, the Rx Mark II Tactical Edition connected by a Fiio L9 line out dock cable which takes the analog stream out of the iPods 30 pin dock connector from my brand new iPod Classic. I store all of my music in AIFF files which I find sound better. This is a nice portable system for my consulting travels on the road. And it sounds terrific! Here are some pictures for those of you into headphones. Here is a view from the top: Side view which shows on/off switch, low/high gain switch, volume toggle and how the Fiio L9 connects the two devices. The headphone jack is on the left and the iPod analog input is one the right via the L9. You can also add an outboard DAC for really top-notch sound. I may do that later.