Originally Posted by Jaska
The Micro Amp is probably not something you want to haul around with you to power your IEMs.
Actually, I'd just keep it in my purs...er...manbag. I contacted HR to see what improvement a new Airhead would have over my 8-year old model, and they said improved clarity and resolution, with perhaps a smidge of bass.
I'd rather spend more and get a _lot_ more, if a lot more is to be had.
I used my ER4's when I'm sitting usually (those cords are way to noisy for any kind of movement), and a largish amp is not necessarily a problem. Small is good, but...
For running or any kind of activity I use my PX100's & no amp.