Originally Posted by Armaegis
Headphoneaddict is probably the best person to ask as I know he has both of those. That said, the HDP is not portable in any fashion, so if you're looking for something on the go then your choice is rather obvious...
That's a coincidence - I sent HeadphoneAddict a message yesterday about this very matter.
I'm aware that the Nuforce HDP requires a power supply; In my above post, I meant I wanted a portable DAC/Amp that isn't being too big that I can't take it with me for use with my laptop when I travel.
On-the-go, I mostly use the iPhone 4 with the HD 25 or the Apple in-ear headphones and it sounds pretty good, considering neither of those headphones completely cancel outside noise and that I listen to music at low to moderate levels. I've not heard any portable DAC/Amps - or just portable amps - though, but I'd be willing to. If I wanted the DAC/amp to be portable for use with my iPhone, I'd probably want one small enough to fit into my trouser pocket or take to the gym, and powerful enough to drive the HD 600/650.
I'm still considering the RSA Predator, and now also the Pico DAC/Amp; the latter's 24/96 support appeals to me. (just noticed that HeadphoneAddict had that as well)
Thanks for replying.